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| ; RUN: opt -instcombine -S < %s | FileCheck %s
|
| define i32 @test1(i32 %x) nounwind {
| %and = and i32 %x, 31
| %sub = sub i32 63, %and
| ret i32 %sub
|
| ; CHECK-LABEL: @test1(
| ; CHECK-NEXT: and i32 %x, 31
| ; CHECK-NEXT: xor i32 %and, 63
| ; CHECK-NEXT: ret
| }
|
| declare i32 @llvm.ctlz.i32(i32, i1) nounwind readnone
|
| define i32 @test2(i32 %x) nounwind {
| %count = tail call i32 @llvm.ctlz.i32(i32 %x, i1 true) nounwind readnone
| %sub = sub i32 31, %count
| ret i32 %sub
|
| ; CHECK-LABEL: @test2(
| ; CHECK-NEXT: ctlz
| ; CHECK-NEXT: xor i32 %count, 31
| ; CHECK-NEXT: ret
| }
|
| define i32 @test3(i32 %x) nounwind {
| %and = and i32 %x, 31
| %sub = xor i32 31, %and
| %add = add i32 %sub, 42
| ret i32 %add
|
| ; CHECK-LABEL: @test3(
| ; CHECK-NEXT: and i32 %x, 31
| ; CHECK-NEXT: sub nsw i32 73, %and
| ; CHECK-NEXT: ret
| }
|
| define i32 @test4(i32 %x) nounwind {
| %sub = xor i32 %x, 2147483648
| %add = add i32 %sub, 42
| ret i32 %add
|
| ; CHECK-LABEL: @test4(
| ; CHECK-NEXT: add i32 %x, -2147483606
| ; CHECK-NEXT: ret
| }
|
|
