| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=instcombine -S | FileCheck %s |
| |
| ; If we have some pattern that leaves only some low bits set, and then performs |
| ; left-shift of those bits, if none of the bits that are left after the final |
| ; shift are modified by the mask, we can omit the mask. |
| |
| ; There are many variants to this pattern: |
| ; a) (x & ((1 << maskNbits) - 1)) << shiftNbits |
| ; simplify to: |
| ; x << shiftNbits |
| ; iff (maskNbits+shiftNbits) u>= bitwidth(x) |
| |
| ; Simple tests. We don't care about extra uses. |
| |
| declare void @use32(i32) |
| |
| define i32 @t0_basic(i32 %x, i32 %nbits) { |
| ; CHECK-LABEL: @t0_basic( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: [[T4:%.*]] = shl i32 [[X]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T4]] |
| ; |
| %t0 = shl i32 1, %nbits |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = and i32 %t1, %x |
| %t3 = sub i32 32, %nbits |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| %t4 = shl i32 %t2, %t3 |
| ret i32 %t4 |
| } |
| |
| define i32 @t1_bigger_shift(i32 %x, i32 %nbits) { |
| ; CHECK-LABEL: @t1_bigger_shift( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 33, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: [[T4:%.*]] = shl i32 [[X]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T4]] |
| ; |
| %t0 = shl i32 1, %nbits |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = and i32 %t1, %x |
| %t3 = sub i32 33, %nbits ; subtracting from bitwidth+1 |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| %t4 = shl i32 %t2, %t3 |
| ret i32 %t4 |
| } |
| |
| define i32 @t2_bigger_mask(i32 %x, i32 %nbits) { |
| ; CHECK-LABEL: @t2_bigger_mask( |
| ; CHECK-NEXT: [[T0:%.*]] = add i32 [[NBITS:%.*]], 1 |
| ; CHECK-NEXT: [[T1:%.*]] = shl nuw i32 1, [[T0]] |
| ; CHECK-NEXT: [[T2:%.*]] = add nsw i32 [[T1]], -1 |
| ; CHECK-NEXT: [[T3:%.*]] = and i32 [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: [[T4:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T4]]) |
| ; CHECK-NEXT: [[T5:%.*]] = shl i32 [[X]], [[T4]] |
| ; CHECK-NEXT: ret i32 [[T5]] |
| ; |
| %t0 = add i32 %nbits, 1 |
| %t1 = shl i32 1, %t0 ; shifting by nbits+1 |
| %t2 = add nsw i32 %t1, -1 |
| %t3 = and i32 %t2, %x |
| %t4 = sub i32 32, %nbits |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| call void @use32(i32 %t4) |
| %t5 = shl i32 %t3, %t4 |
| ret i32 %t5 |
| } |
| |
| ; Vectors |
| |
| declare void @use3xi32(<3 x i32>) |
| |
| define <3 x i32> @t3_vec_splat(<3 x i32> %x, <3 x i32> %nbits) { |
| ; CHECK-LABEL: @t3_vec_splat( |
| ; CHECK-NEXT: [[T1:%.*]] = shl nuw <3 x i32> <i32 1, i32 1, i32 1>, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T2:%.*]] = add nsw <3 x i32> [[T1]], <i32 -1, i32 -1, i32 -1> |
| ; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 32, i32 32, i32 32>, [[NBITS]] |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[NBITS]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]]) |
| ; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]] |
| ; CHECK-NEXT: ret <3 x i32> [[T5]] |
| ; |
| %t0 = add <3 x i32> %nbits, <i32 0, i32 0, i32 0> |
| %t1 = shl <3 x i32> <i32 1, i32 1, i32 1>, %t0 |
| %t2 = add nsw <3 x i32> %t1, <i32 -1, i32 -1, i32 -1> |
| %t3 = and <3 x i32> %t2, %x |
| %t4 = sub <3 x i32> <i32 32, i32 32, i32 32>, %nbits |
| call void @use3xi32(<3 x i32> %t0) |
| call void @use3xi32(<3 x i32> %t1) |
| call void @use3xi32(<3 x i32> %t2) |
| call void @use3xi32(<3 x i32> %t3) |
| call void @use3xi32(<3 x i32> %t4) |
| %t5 = shl <3 x i32> %t3, %t4 |
| ret <3 x i32> %t5 |
| } |
| |
| define <3 x i32> @t4_vec_nonsplat(<3 x i32> %x, <3 x i32> %nbits) { |
| ; CHECK-LABEL: @t4_vec_nonsplat( |
| ; CHECK-NEXT: [[T0:%.*]] = add <3 x i32> [[NBITS:%.*]], <i32 -1, i32 0, i32 1> |
| ; CHECK-NEXT: [[T1:%.*]] = shl nuw <3 x i32> <i32 1, i32 1, i32 1>, [[T0]] |
| ; CHECK-NEXT: [[T2:%.*]] = add nsw <3 x i32> [[T1]], <i32 -1, i32 -1, i32 -1> |
| ; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 33, i32 32, i32 32>, [[NBITS]] |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T0]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]]) |
| ; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]] |
| ; CHECK-NEXT: ret <3 x i32> [[T5]] |
| ; |
| %t0 = add <3 x i32> %nbits, <i32 -1, i32 0, i32 1> |
| %t1 = shl <3 x i32> <i32 1, i32 1, i32 1>, %t0 |
| %t2 = add nsw <3 x i32> %t1, <i32 -1, i32 -1, i32 -1> |
| %t3 = and <3 x i32> %t2, %x |
| %t4 = sub <3 x i32> <i32 33, i32 32, i32 32>, %nbits |
| call void @use3xi32(<3 x i32> %t0) |
| call void @use3xi32(<3 x i32> %t1) |
| call void @use3xi32(<3 x i32> %t2) |
| call void @use3xi32(<3 x i32> %t3) |
| call void @use3xi32(<3 x i32> %t4) |
| %t5 = shl <3 x i32> %t3, %t4 |
| ret <3 x i32> %t5 |
| } |
| |
| define <3 x i32> @t5_vec_poison(<3 x i32> %x, <3 x i32> %nbits) { |
| ; CHECK-LABEL: @t5_vec_poison( |
| ; CHECK-NEXT: [[T1:%.*]] = shl nuw <3 x i32> <i32 1, i32 poison, i32 1>, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T2:%.*]] = add nsw <3 x i32> [[T1]], <i32 -1, i32 poison, i32 -1> |
| ; CHECK-NEXT: [[T3:%.*]] = and <3 x i32> [[T2]], [[X:%.*]] |
| ; CHECK-NEXT: [[T4:%.*]] = sub <3 x i32> <i32 32, i32 poison, i32 32>, [[NBITS]] |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[NBITS]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T1]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T2]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T3]]) |
| ; CHECK-NEXT: call void @use3xi32(<3 x i32> [[T4]]) |
| ; CHECK-NEXT: [[T5:%.*]] = shl <3 x i32> [[X]], [[T4]] |
| ; CHECK-NEXT: ret <3 x i32> [[T5]] |
| ; |
| %t0 = add <3 x i32> %nbits, <i32 0, i32 poison, i32 0> |
| %t1 = shl <3 x i32> <i32 1, i32 poison, i32 1>, %t0 |
| %t2 = add nsw <3 x i32> %t1, <i32 -1, i32 poison, i32 -1> |
| %t3 = and <3 x i32> %t2, %x |
| %t4 = sub <3 x i32> <i32 32, i32 poison, i32 32>, %nbits |
| call void @use3xi32(<3 x i32> %t0) |
| call void @use3xi32(<3 x i32> %t1) |
| call void @use3xi32(<3 x i32> %t2) |
| call void @use3xi32(<3 x i32> %t3) |
| call void @use3xi32(<3 x i32> %t4) |
| %t5 = shl <3 x i32> %t3, %t4 |
| ret <3 x i32> %t5 |
| } |
| |
| ; Commutativity |
| |
| declare i32 @gen32() |
| |
| define i32 @t6_commutativity0(i32 %nbits) { |
| ; CHECK-LABEL: @t6_commutativity0( |
| ; CHECK-NEXT: [[X:%.*]] = call i32 @gen32() |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = and i32 [[X]], [[T1]] |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: [[T4:%.*]] = shl i32 [[X]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T4]] |
| ; |
| %x = call i32 @gen32() |
| %t0 = shl i32 1, %nbits |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = and i32 %x, %t1 ; swapped |
| %t3 = sub i32 32, %nbits |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| %t4 = shl i32 %t2, %t3 |
| ret i32 %t4 |
| } |
| |
| define i32 @t7_commutativity1(i32 %nbits0, i32 %nbits1) { |
| ; CHECK-LABEL: @t7_commutativity1( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS0:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = shl nuw i32 1, [[NBITS1:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = add nsw i32 [[T2]], -1 |
| ; CHECK-NEXT: [[T4:%.*]] = and i32 [[T3]], [[T1]] |
| ; CHECK-NEXT: [[T5:%.*]] = sub i32 32, [[NBITS0]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T4]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T5]]) |
| ; CHECK-NEXT: [[T6:%.*]] = shl i32 [[T4]], [[T5]] |
| ; CHECK-NEXT: ret i32 [[T6]] |
| ; |
| %t0 = shl i32 1, %nbits0 |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = shl i32 1, %nbits1 |
| %t3 = add nsw i32 %t2, -1 |
| %t4 = and i32 %t3, %t1 ; both hands of 'and' could be mask.. |
| %t5 = sub i32 32, %nbits0 |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| call void @use32(i32 %t4) |
| call void @use32(i32 %t5) |
| %t6 = shl i32 %t4, %t5 |
| ret i32 %t6 |
| } |
| define i32 @t8_commutativity2(i32 %nbits0, i32 %nbits1) { |
| ; CHECK-LABEL: @t8_commutativity2( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS0:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = shl nuw i32 1, [[NBITS1:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = add nsw i32 [[T2]], -1 |
| ; CHECK-NEXT: [[T4:%.*]] = and i32 [[T3]], [[T1]] |
| ; CHECK-NEXT: [[T5:%.*]] = sub i32 32, [[NBITS1]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T4]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T5]]) |
| ; CHECK-NEXT: [[T6:%.*]] = shl i32 [[T1]], [[T5]] |
| ; CHECK-NEXT: ret i32 [[T6]] |
| ; |
| %t0 = shl i32 1, %nbits0 |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = shl i32 1, %nbits1 |
| %t3 = add nsw i32 %t2, -1 |
| %t4 = and i32 %t3, %t1 ; both hands of 'and' could be mask.. |
| %t5 = sub i32 32, %nbits1 |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| call void @use32(i32 %t4) |
| call void @use32(i32 %t5) |
| %t6 = shl i32 %t4, %t5 |
| ret i32 %t6 |
| } |
| |
| ; Fast-math flags. We must not preserve them! |
| |
| define i32 @t9_nuw(i32 %x, i32 %nbits) { |
| ; CHECK-LABEL: @t9_nuw( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: [[T4:%.*]] = shl i32 [[X]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T4]] |
| ; |
| %t0 = shl i32 1, %nbits |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = and i32 %t1, %x |
| %t3 = sub i32 32, %nbits |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| %t4 = shl nuw i32 %t2, %t3 |
| ret i32 %t4 |
| } |
| |
| define i32 @t10_nsw(i32 %x, i32 %nbits) { |
| ; CHECK-LABEL: @t10_nsw( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: [[T4:%.*]] = shl i32 [[X]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T4]] |
| ; |
| %t0 = shl i32 1, %nbits |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = and i32 %t1, %x |
| %t3 = sub i32 32, %nbits |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| %t4 = shl nsw i32 %t2, %t3 |
| ret i32 %t4 |
| } |
| |
| define i32 @t11_nuw_nsw(i32 %x, i32 %nbits) { |
| ; CHECK-LABEL: @t11_nuw_nsw( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: [[T4:%.*]] = shl i32 [[X]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T4]] |
| ; |
| %t0 = shl i32 1, %nbits |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = and i32 %t1, %x |
| %t3 = sub i32 32, %nbits |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| %t4 = shl nuw nsw i32 %t2, %t3 |
| ret i32 %t4 |
| } |
| |
| ; Negative tests |
| |
| define i32 @n12_not_minus_one(i32 %x, i32 %nbits) { |
| ; CHECK-LABEL: @n12_not_minus_one( |
| ; CHECK-NEXT: [[T0:%.*]] = shl i32 2, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nsw i32 [[T0]], -1 |
| ; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: [[T4:%.*]] = shl i32 [[T2]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T4]] |
| ; |
| %t0 = shl i32 2, %nbits ; shifting not '-1' |
| %t1 = add nsw i32 %t0, -1 |
| %t2 = and i32 %t1, %x |
| %t3 = sub i32 32, %nbits |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| %t4 = shl i32 %t2, %t3 |
| ret i32 %t4 |
| } |
| |
| define i32 @n13_not_minus_one(i32 %x, i32 %nbits) { |
| ; CHECK-LABEL: @n13_not_minus_one( |
| ; CHECK-NEXT: [[T0:%.*]] = shl nuw i32 1, [[NBITS:%.*]] |
| ; CHECK-NEXT: [[T1:%.*]] = add nuw nsw i32 [[T0]], 2147483647 |
| ; CHECK-NEXT: [[T2:%.*]] = and i32 [[T1]], [[X:%.*]] |
| ; CHECK-NEXT: [[T3:%.*]] = sub i32 32, [[NBITS]] |
| ; CHECK-NEXT: call void @use32(i32 [[T0]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T1]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T2]]) |
| ; CHECK-NEXT: call void @use32(i32 [[T3]]) |
| ; CHECK-NEXT: [[T4:%.*]] = shl i32 [[T2]], [[T3]] |
| ; CHECK-NEXT: ret i32 [[T4]] |
| ; |
| %t0 = shl i32 1, %nbits |
| %t1 = add nsw i32 %t0, 2147483647 ; adding not '-1' |
| %t2 = and i32 %t1, %x |
| %t3 = sub i32 32, %nbits |
| call void @use32(i32 %t0) |
| call void @use32(i32 %t1) |
| call void @use32(i32 %t2) |
| call void @use32(i32 %t3) |
| %t4 = shl i32 %t2, %t3 |
| ret i32 %t4 |
| } |