| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| ; If we have some pattern that leaves only some low bits set, and then performs |
| ; left-shift of those bits, we can combine those two shifts into a shift+mask. |
| |
| ; There are many variants to this pattern: |
| ; b) (trunc ((x & (~(-1 << maskNbits))))) << shiftNbits |
| ; simplify to: |
| ; ((trunc(x)) << shiftNbits) & (~(-1 << (maskNbits+shiftNbits))) |
| |
| ; Simple tests. |
| |
| declare void @use32(i32) |
| declare void @use64(i64) |
| |
| define i32 @t0_basic(i64 %x, i32 %nbits) { |
| ; CHECK-LABEL: @t0_basic( |
| ; CHECK-NEXT: [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64 |
| ; CHECK-NEXT: [[T1:%.*]] = shl i64 -1, [[T0]] |
| ; CHECK-NEXT: [[T2:%.*]] = xor i64 [[T1]], -1 |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: [[T4:%.*]] = and i64 [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[NBITS]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T0]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T1]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T4]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[X]] to i32 |
| ; CHECK-NEXT: [[T6:%.*]] = shl i32 [[TMP1]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T6]] |
| ; |
| %t0 = zext i32 %nbits to i64 |
| %t1 = shl i64 -1, %t0 |
| %t2 = xor i64 %t1, -1 |
| %t3 = sub i32 32, %nbits |
| %t4 = and i64 %t2, %x |
| |
| call void @use32(i32 %nbits) |
| call void @use64(i64 %t0) |
| call void @use64(i64 %t1) |
| call void @use64(i64 %t2) |
| call void @use32(i32 %t3) |
| call void @use64(i64 %t4) |
| |
| %t5 = trunc i64 %t4 to i32 |
| %t6 = shl i32 %t5, %t3 |
| ret i32 %t6 |
| } |
| |
| ; Vectors |
| |
| declare void @use8xi32(<8 x i32>) |
| declare void @use8xi64(<8 x i64>) |
| |
| define <8 x i32> @t1_vec_splat(<8 x i64> %x, <8 x i32> %nbits) { |
| ; CHECK-LABEL: @t1_vec_splat( |
| ; CHECK-NEXT: [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64> |
| ; CHECK-NEXT: [[T1:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, [[T0]] |
| ; CHECK-NEXT: [[T2:%.*]] = xor <8 x i64> [[T1]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1> |
| ; CHECK-NEXT: [[T3:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]] |
| ; CHECK-NEXT: [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use8xi32(<8 x i32> [[NBITS]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T0]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T1]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T2]]) |
| ; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T3]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T4]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32> |
| ; CHECK-NEXT: [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]] |
| ; CHECK-NEXT: ret <8 x i32> [[T6]] |
| ; |
| %t0 = zext <8 x i32> %nbits to <8 x i64> |
| %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t0 |
| %t2 = xor <8 x i64> %t1, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1> |
| %t3 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits |
| %t4 = and <8 x i64> %t2, %x |
| |
| call void @use8xi32(<8 x i32> %nbits) |
| call void @use8xi64(<8 x i64> %t0) |
| call void @use8xi64(<8 x i64> %t1) |
| call void @use8xi64(<8 x i64> %t2) |
| call void @use8xi32(<8 x i32> %t3) |
| call void @use8xi64(<8 x i64> %t4) |
| |
| %t5 = trunc <8 x i64> %t4 to <8 x i32> |
| %t6 = shl <8 x i32> %t5, %t3 |
| ret <8 x i32> %t6 |
| } |
| |
| define <8 x i32> @t2_vec_splat_undef(<8 x i64> %x, <8 x i32> %nbits) { |
| ; CHECK-LABEL: @t2_vec_splat_undef( |
| ; CHECK-NEXT: [[T0:%.*]] = zext <8 x i32> [[NBITS:%.*]] to <8 x i64> |
| ; CHECK-NEXT: [[T1:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, [[T0]] |
| ; CHECK-NEXT: [[T2:%.*]] = xor <8 x i64> [[T1]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1> |
| ; CHECK-NEXT: [[T3:%.*]] = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, [[NBITS]] |
| ; CHECK-NEXT: [[T4:%.*]] = and <8 x i64> [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use8xi32(<8 x i32> [[NBITS]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T0]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T1]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T2]]) |
| ; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T3]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T4]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32> |
| ; CHECK-NEXT: [[T6:%.*]] = shl <8 x i32> [[TMP1]], [[T3]] |
| ; CHECK-NEXT: ret <8 x i32> [[T6]] |
| ; |
| %t0 = zext <8 x i32> %nbits to <8 x i64> |
| %t1 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1>, %t0 |
| %t2 = xor <8 x i64> %t1, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 undef, i64 -1> |
| %t3 = sub <8 x i32> <i32 32, i32 32, i32 32, i32 32, i32 32, i32 32, i32 undef, i32 32>, %nbits |
| %t4 = and <8 x i64> %t2, %x |
| |
| call void @use8xi32(<8 x i32> %nbits) |
| call void @use8xi64(<8 x i64> %t0) |
| call void @use8xi64(<8 x i64> %t1) |
| call void @use8xi64(<8 x i64> %t2) |
| call void @use8xi32(<8 x i32> %t3) |
| call void @use8xi64(<8 x i64> %t4) |
| |
| %t5 = trunc <8 x i64> %t4 to <8 x i32> |
| %t6 = shl <8 x i32> %t5, %t3 |
| ret <8 x i32> %t6 |
| } |
| |
| define <8 x i32> @t3_vec_nonsplat(<8 x i64> %x, <8 x i32> %nbits) { |
| ; CHECK-LABEL: @t3_vec_nonsplat( |
| ; CHECK-NEXT: [[T0:%.*]] = add <8 x i32> [[NBITS:%.*]], <i32 -1, i32 0, i32 0, i32 1, i32 0, i32 0, i32 0, i32 0> |
| ; CHECK-NEXT: [[T1:%.*]] = zext <8 x i32> [[T0]] to <8 x i64> |
| ; CHECK-NEXT: [[T2:%.*]] = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, [[T1]] |
| ; CHECK-NEXT: [[T3:%.*]] = xor <8 x i64> [[T2]], <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1> |
| ; CHECK-NEXT: [[T4:%.*]] = sub <8 x i32> <i32 33, i32 32, i32 33, i32 32, i32 32, i32 32, i32 32, i32 32>, [[NBITS]] |
| ; CHECK-NEXT: [[T5:%.*]] = and <8 x i64> [[T3]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T0]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T1]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T2]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T3]]) |
| ; CHECK-NEXT: call void @use8xi32(<8 x i32> [[T4]]) |
| ; CHECK-NEXT: call void @use8xi64(<8 x i64> [[T5]]) |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc <8 x i64> [[X]] to <8 x i32> |
| ; CHECK-NEXT: [[T7:%.*]] = shl <8 x i32> [[TMP1]], [[T4]] |
| ; CHECK-NEXT: ret <8 x i32> [[T7]] |
| ; |
| %t0 = add <8 x i32> %nbits, <i32 -1, i32 0, i32 0, i32 1, i32 0, i32 0, i32 0, i32 0> |
| %t1 = zext <8 x i32> %t0 to <8 x i64> |
| %t2 = shl <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1>, %t1 ; shifting by nbits-1 |
| %t3 = xor <8 x i64> %t2, <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1> |
| %t4 = sub <8 x i32> <i32 33, i32 32, i32 33, i32 32, i32 32, i32 32, i32 32, i32 32>, %nbits |
| %t5 = and <8 x i64> %t3, %x |
| |
| call void @use8xi32(<8 x i32> %t0) |
| call void @use8xi64(<8 x i64> %t1) |
| call void @use8xi64(<8 x i64> %t2) |
| call void @use8xi64(<8 x i64> %t3) |
| call void @use8xi32(<8 x i32> %t4) |
| call void @use8xi64(<8 x i64> %t5) |
| |
| %t6 = trunc <8 x i64> %t5 to <8 x i32> |
| %t7 = shl <8 x i32> %t6, %t4 |
| ret <8 x i32> %t7 |
| } |
| |
| ; -1 can be truncated. |
| |
| define i32 @t4_allones_trunc(i64 %x, i32 %nbits) { |
| ; CHECK-LABEL: @t4_allones_trunc( |
| ; CHECK-NEXT: [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64 |
| ; CHECK-NEXT: [[T1:%.*]] = shl i64 -1, [[T0]] |
| ; CHECK-NEXT: [[T2:%.*]] = xor i64 [[T1]], 4294967295 |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: [[T4:%.*]] = and i64 [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[NBITS]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T0]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T1]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T4]]) |
| ; CHECK-NEXT: [[T5:%.*]] = trunc i64 [[T4]] to i32 |
| ; CHECK-NEXT: [[T6:%.*]] = shl i32 [[T5]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T6]] |
| ; |
| %t0 = zext i32 %nbits to i64 |
| %t1 = shl i64 -1, %t0 |
| %t2 = xor i64 %t1, 4294967295 |
| %t3 = sub i32 32, %nbits |
| %t4 = and i64 %t2, %x |
| |
| call void @use32(i32 %nbits) |
| call void @use64(i64 %t0) |
| call void @use64(i64 %t1) |
| call void @use64(i64 %t2) |
| call void @use32(i32 %t3) |
| call void @use64(i64 %t4) |
| |
| %t5 = trunc i64 %t4 to i32 |
| %t6 = shl i32 %t5, %t3 |
| ret i32 %t6 |
| } |
| |
| ; Extra uses |
| |
| define i32 @n5_extrause(i64 %x, i32 %nbits) { |
| ; CHECK-LABEL: @n5_extrause( |
| ; CHECK-NEXT: [[T0:%.*]] = zext i32 [[NBITS:%.*]] to i64 |
| ; CHECK-NEXT: [[T1:%.*]] = shl i64 -1, [[T0]] |
| ; CHECK-NEXT: [[T2:%.*]] = xor i64 [[T1]], -1 |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: [[T4:%.*]] = and i64 [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: call void @use32(i32 [[NBITS]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T0]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T1]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: call void @use64(i64 [[T4]]) |
| ; CHECK-NEXT: [[T5:%.*]] = trunc i64 [[T4]] to i32 |
| ; CHECK-NEXT: call void @use32(i32 [[T5]]) |
| ; CHECK-NEXT: [[T6:%.*]] = shl i32 [[T5]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T6]] |
| ; |
| %t0 = zext i32 %nbits to i64 |
| %t1 = shl i64 -1, %t0 |
| %t2 = xor i64 %t1, -1 |
| %t3 = sub i32 32, %nbits |
| %t4 = and i64 %t2, %x |
| |
| call void @use32(i32 %nbits) |
| call void @use64(i64 %t0) |
| call void @use64(i64 %t1) |
| call void @use64(i64 %t2) |
| call void @use32(i32 %t3) |
| call void @use64(i64 %t4) |
| |
| %t5 = trunc i64 %t4 to i32 |
| call void @use32(i32 %t5) |
| %t6 = shl i32 %t5, %t3 |
| ret i32 %t6 |
| } |