1 ; RUN: opt < %s -instcombine -S | FileCheck %s
4 ; CHECK: %y = sub i32 0, %x
5 ; CHECK: %z = sdiv i32 %y, 337
7 define i32 @sub1(i32 %x) {
14 ; CHECK: %z = sdiv i32 %x, -337
16 define i32 @sub2(i32 %x) {
17 %y = sub nsw i32 0, %x
22 ; CHECK-LABEL: @shl_icmp(
23 ; CHECK: %B = icmp eq i64 %X, 0
25 define i1 @shl_icmp(i64 %X) nounwind {
26 %A = shl nuw i64 %X, 2 ; X/4
27 %B = icmp eq i64 %A, 0
32 ; CHECK: %B = shl nuw nsw i64 %A, 8
34 define i64 @shl1(i64 %X, i64* %P) nounwind {
36 store i64 %A, i64* %P ; multiple uses of A.
41 ; CHECK-LABEL: @preserve1(
42 ; CHECK: add nsw i32 %x, 5
43 define i32 @preserve1(i32 %x) nounwind {
44 %add = add nsw i32 %x, 2
45 %add3 = add nsw i32 %add, 3
49 ; CHECK-LABEL: @nopreserve1(
50 ; CHECK: add i8 %x, -126
51 define i8 @nopreserve1(i8 %x) nounwind {
52 %add = add nsw i8 %x, 127
53 %add3 = add nsw i8 %add, 3
57 ; CHECK-LABEL: @nopreserve2(
59 define i8 @nopreserve2(i8 %x) nounwind {
61 %add3 = add nsw i8 %add, 2
65 ; CHECK-LABEL: @nopreserve3(
66 ; CHECK: add i8 %A, %B
68 define i8 @nopreserve3(i8 %A, i8 %B) nounwind {
71 %add = add nsw i8 %x, %y
75 ; CHECK-LABEL: @nopreserve4(
76 ; CHECK: add i8 %A, %B
78 define i8 @nopreserve4(i8 %A, i8 %B) nounwind {
79 %x = add nsw i8 %A, 10
80 %y = add nsw i8 %B, 10
81 %add = add nsw i8 %x, %y