42 lines
1.1 KiB
LLVM
42 lines
1.1 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
;
|
|
; This test makes sure that InstCombine does not replace the sequence of
|
|
; xor/sub instruction followed by cmp instruction into a single cmp instruction
|
|
; if there is more than one use of xor/sub.
|
|
|
|
define zeroext i1 @test1(i32 %lhs, i32 %rhs) {
|
|
; CHECK-LABEL: @test1(
|
|
; CHECK-NEXT: %xor = xor i32 %lhs, 5
|
|
; CHECK-NEXT: %cmp1 = icmp eq i32 %xor, 10
|
|
|
|
%xor = xor i32 %lhs, 5
|
|
%cmp1 = icmp eq i32 %xor, 10
|
|
%cmp2 = icmp eq i32 %xor, %rhs
|
|
%sel = or i1 %cmp1, %cmp2
|
|
ret i1 %sel
|
|
}
|
|
|
|
define zeroext i1 @test2(i32 %lhs, i32 %rhs) {
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK-NEXT: %xor = xor i32 %lhs, %rhs
|
|
; CHECK-NEXT: %cmp1 = icmp eq i32 %xor, 0
|
|
|
|
%xor = xor i32 %lhs, %rhs
|
|
%cmp1 = icmp eq i32 %xor, 0
|
|
%cmp2 = icmp eq i32 %xor, 32
|
|
%sel = xor i1 %cmp1, %cmp2
|
|
ret i1 %sel
|
|
}
|
|
|
|
define zeroext i1 @test3(i32 %lhs, i32 %rhs) {
|
|
; CHECK-LABEL: @test3(
|
|
; CHECK-NEXT: %sub = sub nsw i32 %lhs, %rhs
|
|
; CHECK-NEXT: %cmp1 = icmp eq i32 %sub, 0
|
|
|
|
%sub = sub nsw i32 %lhs, %rhs
|
|
%cmp1 = icmp eq i32 %sub, 0
|
|
%cmp2 = icmp eq i32 %sub, 31
|
|
%sel = or i1 %cmp1, %cmp2
|
|
ret i1 %sel
|
|
}
|