| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| declare void @use16(i16) |
| declare void @use32(i32) |
| declare void @use64(i64) |
| |
| define i32 @t0(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @t0( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = ashr i64 [[DATA]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = trunc i64 [[TMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret i32 %signextended |
| } |
| define i32 @t0_zext_of_nbits(i64 %data, i8 %nbits_narrow) { |
| ; CHECK-LABEL: @t0_zext_of_nbits( |
| ; CHECK-NEXT: [[NBITS:%.*]] = zext i8 [[NBITS_NARROW:%.*]] to i16 |
| ; CHECK-NEXT: call void @use16(i16 [[NBITS]]) |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub nsw i16 64, [[NBITS]] |
| ; CHECK-NEXT: call void @use16(i16 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i16 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW_NARROW:%.*]] = sub nsw i16 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use16(i16 [[NUM_HIGH_BITS_TO_SMEAR_NARROW_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = zext i16 [[NUM_HIGH_BITS_TO_SMEAR_NARROW_NARROW]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = ashr i64 [[DATA]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = trunc i64 [[TMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %nbits = zext i8 %nbits_narrow to i16 |
| call void @use16(i16 %nbits) |
| %skip_high = sub i16 64, %nbits |
| call void @use16(i16 %skip_high) |
| %skip_high_wide = zext i16 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow_narrow = sub i16 32, %nbits |
| call void @use16(i16 %num_high_bits_to_smear_narrow_narrow) |
| %num_high_bits_to_smear_narrow = zext i16 %num_high_bits_to_smear_narrow_narrow to i32 |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret i32 %signextended |
| } |
| define i32 @t0_exact(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @t0_exact( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr exact i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = ashr exact i64 [[DATA]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = trunc i64 [[TMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr exact i64 %data, %skip_high_wide ; We can preserve `exact`-ness of the original shift. |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret i32 %signextended |
| } |
| |
| define i32 @t1_redundant_sext(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @t1_redundant_sext( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED_WITH_SIGNEXTENSION:%.*]] = ashr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED_WITH_SIGNEXTENSION]]) |
| ; CHECK-NEXT: [[EXTRACTED_WITH_SIGNEXTENSION_NARROW:%.*]] = trunc i64 [[EXTRACTED_WITH_SIGNEXTENSION]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_WITH_SIGNEXTENSION_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_WITH_SIGNEXTENSION_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: call void @use32(i32 [[SIGNBIT_POSITIONED]]) |
| ; CHECK-NEXT: ret i32 [[EXTRACTED_WITH_SIGNEXTENSION_NARROW]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted_with_signextension = ashr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted_with_signextension) |
| %extracted_with_signextension_narrow = trunc i64 %extracted_with_signextension to i32 ; this is already the answer. |
| call void @use32(i32 %extracted_with_signextension_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_with_signextension_narrow, %num_high_bits_to_smear_narrow |
| call void @use32(i32 %signbit_positioned) |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret i32 %signextended |
| } |
| |
| define i64 @t2_notrunc(i64 %data, i64 %nbits) { |
| ; CHECK-LABEL: @t2_notrunc( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i64 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR:%.*]] = sub i64 64, [[NBITS]] |
| ; CHECK-NEXT: call void @use64(i64 [[NUM_HIGH_BITS_TO_SMEAR]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i64 [[EXTRACTED]], [[NUM_HIGH_BITS_TO_SMEAR]] |
| ; CHECK-NEXT: call void @use64(i64 [[SIGNBIT_POSITIONED]]) |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i64 [[DATA]], [[SKIP_HIGH]] |
| ; CHECK-NEXT: ret i64 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i64 64, %nbits |
| call void @use64(i64 %skip_high) |
| %extracted = lshr i64 %data, %skip_high |
| call void @use64(i64 %extracted) |
| %num_high_bits_to_smear = sub i64 64, %nbits |
| call void @use64(i64 %num_high_bits_to_smear) |
| %signbit_positioned = shl i64 %extracted, %num_high_bits_to_smear ; |
| call void @use64(i64 %signbit_positioned) |
| %signextended = ashr i64 %signbit_positioned, %num_high_bits_to_smear ; can just shift %data itself. |
| ret i64 %signextended |
| } |
| |
| define i64 @t3_notrunc_redundant_sext(i64 %data, i64 %nbits) { |
| ; CHECK-LABEL: @t3_notrunc_redundant_sext( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i64 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = ashr i64 [[DATA:%.*]], [[SKIP_HIGH]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR:%.*]] = sub i64 64, [[NBITS]] |
| ; CHECK-NEXT: call void @use64(i64 [[NUM_HIGH_BITS_TO_SMEAR]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i64 [[EXTRACTED]], [[NUM_HIGH_BITS_TO_SMEAR]] |
| ; CHECK-NEXT: call void @use64(i64 [[SIGNBIT_POSITIONED]]) |
| ; CHECK-NEXT: ret i64 [[EXTRACTED]] |
| ; |
| %skip_high = sub i64 64, %nbits |
| call void @use64(i64 %skip_high) |
| %extracted = ashr i64 %data, %skip_high ; this is already the answer. |
| call void @use64(i64 %extracted) |
| %num_high_bits_to_smear = sub i64 64, %nbits |
| call void @use64(i64 %num_high_bits_to_smear) |
| %signbit_positioned = shl i64 %extracted, %num_high_bits_to_smear |
| call void @use64(i64 %signbit_positioned) |
| %signextended = ashr i64 %signbit_positioned, %num_high_bits_to_smear |
| ret i64 %signextended |
| } |
| |
| define <2 x i32> @t4_vec(<2 x i64> %data, <2 x i32> %nbits) { |
| ; CHECK-LABEL: @t4_vec( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub <2 x i32> <i32 64, i32 64>, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext <2 x i32> [[SKIP_HIGH]] to <2 x i64> |
| ; CHECK-NEXT: [[TMP1:%.*]] = ashr <2 x i64> [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = trunc <2 x i64> [[TMP1]] to <2 x i32> |
| ; CHECK-NEXT: ret <2 x i32> [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub <2 x i32> <i32 64, i32 64>, %nbits |
| %skip_high_wide = zext <2 x i32> %skip_high to <2 x i64> |
| %extracted = lshr <2 x i64> %data, %skip_high_wide |
| %extracted_narrow = trunc <2 x i64> %extracted to <2 x i32> |
| %num_high_bits_to_smear_narrow = sub <2 x i32> <i32 32, i32 32>, %nbits |
| %signbit_positioned = shl <2 x i32> %extracted_narrow, %num_high_bits_to_smear_narrow |
| %signextended = ashr <2 x i32> %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret <2 x i32> %signextended |
| } |
| |
| define <3 x i32> @t5_vec_undef(<3 x i64> %data, <3 x i32> %nbits) { |
| ; CHECK-LABEL: @t5_vec_undef( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub <3 x i32> <i32 64, i32 64, i32 undef>, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext <3 x i32> [[SKIP_HIGH]] to <3 x i64> |
| ; CHECK-NEXT: [[TMP1:%.*]] = ashr <3 x i64> [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = trunc <3 x i64> [[TMP1]] to <3 x i32> |
| ; CHECK-NEXT: ret <3 x i32> [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub <3 x i32> <i32 64, i32 64, i32 undef>, %nbits |
| %skip_high_wide = zext <3 x i32> %skip_high to <3 x i64> |
| %extracted = lshr <3 x i64> %data, %skip_high_wide |
| %extracted_narrow = trunc <3 x i64> %extracted to <3 x i32> |
| %num_high_bits_to_smear_narrow0 = sub <3 x i32> <i32 32, i32 32, i32 undef>, %nbits |
| %num_high_bits_to_smear_narrow1 = sub <3 x i32> <i32 undef, i32 32, i32 32>, %nbits |
| %signbit_positioned = shl <3 x i32> %extracted_narrow, %num_high_bits_to_smear_narrow0 |
| %signextended = ashr <3 x i32> %signbit_positioned, %num_high_bits_to_smear_narrow1 |
| ret <3 x i32> %signextended |
| } |
| |
| ; Extra-uses |
| define i32 @t6_extrause_good0(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @t6_extrause_good0( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = ashr i64 [[DATA]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = trunc i64 [[TMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow ; will go away |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret i32 %signextended |
| } |
| define i32 @t7_extrause_good1(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @t7_extrause_good1( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW0:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW0]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW0]] |
| ; CHECK-NEXT: call void @use32(i32 [[SIGNBIT_POSITIONED]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = ashr i64 [[DATA]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = trunc i64 [[TMP1]] to i32 |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow0 = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow0) |
| %num_high_bits_to_smear_narrow1 = sub i32 32, %nbits ; will go away. |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow0 |
| call void @use32(i32 %signbit_positioned) |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow1 |
| ret i32 %signextended |
| } |
| define i32 @n8_extrause_bad(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @n8_extrause_bad( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: call void @use32(i32 [[SIGNBIT_POSITIONED]]) |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| call void @use32(i32 %signbit_positioned) |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow ; neither of operands will go away. |
| ret i32 %signextended |
| } |
| |
| ; Negative tests |
| define i32 @n9(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @n9( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 63, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 63, %nbits ; not 64 |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret i32 %signextended |
| } |
| |
| define i32 @n10(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @n10( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 31, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 31, %nbits ; not 32 |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret i32 %signextended |
| } |
| |
| define i32 @n11(i64 %data, i32 %nbits1, i32 %nbits2) { |
| ; CHECK-LABEL: @n11( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS1:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS2:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 64, %nbits1 ; not %nbits2 |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits2 ; not %nbits1 |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow |
| ret i32 %signextended |
| } |
| |
| define i32 @n12(i64 %data, i32 %nbits1, i32 %nbits2) { |
| ; CHECK-LABEL: @n12( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS1:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW1:%.*]] = sub i32 32, [[NBITS1]] |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW2:%.*]] = sub i32 32, [[NBITS2:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW2]]) |
| ; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW1]] |
| ; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW2]] |
| ; CHECK-NEXT: ret i32 [[SIGNEXTENDED]] |
| ; |
| %skip_high = sub i32 64, %nbits1 |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow1 = sub i32 32, %nbits1 ; not %nbits2 |
| %num_high_bits_to_smear_narrow2 = sub i32 32, %nbits2 ; not %nbits1 |
| call void @use32(i32 %num_high_bits_to_smear_narrow1) |
| call void @use32(i32 %num_high_bits_to_smear_narrow2) |
| %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow1 |
| %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow2 |
| ret i32 %signextended |
| } |
| |
| define i32 @n13(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @n13( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = lshr i32 -1, [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: [[RES:%.*]] = and i32 [[TMP1]], [[EXTRACTED_NARROW]] |
| ; CHECK-NEXT: ret i32 [[RES]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %highbits_cleaned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| %res = lshr i32 %highbits_cleaned, %num_high_bits_to_smear_narrow ; not ashr |
| ret i32 %res |
| } |
| define i32 @n13_extrause(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @n13_extrause( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[HIGHBITS_CLEANED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: call void @use32(i32 [[HIGHBITS_CLEANED]]) |
| ; CHECK-NEXT: [[RES:%.*]] = lshr i32 [[HIGHBITS_CLEANED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: ret i32 [[RES]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = lshr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %highbits_cleaned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| call void @use32(i32 %highbits_cleaned) |
| %res = lshr i32 %highbits_cleaned, %num_high_bits_to_smear_narrow ; not ashr |
| ret i32 %res |
| } |
| define i32 @n14(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @n14( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = ashr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = lshr i32 -1, [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: [[RES:%.*]] = and i32 [[TMP1]], [[EXTRACTED_NARROW]] |
| ; CHECK-NEXT: ret i32 [[RES]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = ashr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %highbits_cleaned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| %res = lshr i32 %highbits_cleaned, %num_high_bits_to_smear_narrow ; not ashr |
| ret i32 %res |
| } |
| define i32 @n14_extrause(i64 %data, i32 %nbits) { |
| ; CHECK-LABEL: @n14_extrause( |
| ; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]]) |
| ; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64 |
| ; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]]) |
| ; CHECK-NEXT: [[EXTRACTED:%.*]] = ashr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]] |
| ; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]]) |
| ; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]]) |
| ; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]) |
| ; CHECK-NEXT: [[HIGHBITS_CLEANED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: call void @use32(i32 [[HIGHBITS_CLEANED]]) |
| ; CHECK-NEXT: [[RES:%.*]] = lshr i32 [[HIGHBITS_CLEANED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]] |
| ; CHECK-NEXT: ret i32 [[RES]] |
| ; |
| %skip_high = sub i32 64, %nbits |
| call void @use32(i32 %skip_high) |
| %skip_high_wide = zext i32 %skip_high to i64 |
| call void @use64(i64 %skip_high_wide) |
| %extracted = ashr i64 %data, %skip_high_wide |
| call void @use64(i64 %extracted) |
| %extracted_narrow = trunc i64 %extracted to i32 |
| call void @use32(i32 %extracted_narrow) |
| %num_high_bits_to_smear_narrow = sub i32 32, %nbits |
| call void @use32(i32 %num_high_bits_to_smear_narrow) |
| %highbits_cleaned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow |
| call void @use32(i32 %highbits_cleaned) |
| %res = lshr i32 %highbits_cleaned, %num_high_bits_to_smear_narrow ; not ashr |
| ret i32 %res |
| } |
