1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt < %s -reassociate -dce -S | FileCheck %s
5 ; Verify the nsw flags are preserved when converting shl to mul.
7 define i32 @shl_to_mul_nsw(i32 %i) {
9 ; CHECK-LABEL: @shl_to_mul_nsw(
11 ; CHECK-NEXT: [[MUL:%.*]] = mul i32 [[I:%.*]], -2147483648
12 ; CHECK-NEXT: [[MUL2:%.*]] = add i32 [[MUL]], 1
13 ; CHECK-NEXT: ret i32 [[MUL2]]
16 %mul = shl nsw i32 %i, 31
17 %mul2 = add i32 %mul, 1
21 define i32 @shl_to_mul_nuw(i32 %i) {
23 ; CHECK-LABEL: @shl_to_mul_nuw(
25 ; CHECK-NEXT: [[MUL:%.*]] = mul nuw i32 [[I:%.*]], 4
26 ; CHECK-NEXT: [[MUL2:%.*]] = add i32 [[MUL]], 1
27 ; CHECK-NEXT: ret i32 [[MUL2]]
30 %mul = shl nuw i32 %i, 2
31 %mul2 = add i32 %mul, 1
35 define i32 @shl_to_mul_nuw_nsw(i32 %i) {
37 ; CHECK-LABEL: @shl_to_mul_nuw_nsw(
39 ; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i32 [[I:%.*]], 4
40 ; CHECK-NEXT: [[MUL2:%.*]] = add i32 [[MUL]], 1
41 ; CHECK-NEXT: ret i32 [[MUL2]]
44 %mul = shl nuw nsw i32 %i, 2
45 %mul2 = add i32 %mul, 1
49 define i2 @pr23926(i2 %X1, i2 %X2) {
51 ; CHECK-LABEL: @pr23926(
52 ; CHECK-NEXT: [[X1_NEG:%.*]] = sub i2 0, [[X1:%.*]]
53 ; CHECK-NEXT: [[ADD_NEG:%.*]] = add i2 [[X1_NEG]], -1
54 ; CHECK-NEXT: [[SUB:%.*]] = add i2 [[ADD_NEG]], [[X2:%.*]]
55 ; CHECK-NEXT: ret i2 [[SUB]]
57 %add = add nuw i2 %X1, 1
58 %sub = sub nuw nsw i2 %X2, %add