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llvm-mirror/test/CodeGen/X86/bool-zext.ll

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Add a test for i1 zeroext arguments on x86-64. We currently generate code that conforms to the ABI, but DAGCombine could in theory recognize the sequence of zext asserts and truncates and generate incorrect code. llvm-svn: 127754
2011-03-16 21:15:44 +01:00
; RUN: llc < %s -march=x86-64 | FileCheck %s
; CHECK: @bar1
; CHECK: movzbl
; CHECK: callq
define void @bar1(i1 zeroext %v1) nounwind ssp {
entry:
%conv = zext i1 %v1 to i32
The x86-64 ABI says that a bool is only guaranteed to be sign-extended to a byte rather than an int. Thankfully, this only causes LLVM to miss optimizations, not generate incorrect code. This just fixes the zext at the return. We still insert an i32 ZextAssert when reading a function's arguments, but it is followed by a truncate and another i8 ZextAssert so it is not optimized. llvm-svn: 127766
2011-03-16 23:20:18 +01:00
%call = tail call i32 (...)* @foo1(i32 %conv) nounwind
Add a test for i1 zeroext arguments on x86-64. We currently generate code that conforms to the ABI, but DAGCombine could in theory recognize the sequence of zext asserts and truncates and generate incorrect code. llvm-svn: 127754
2011-03-16 21:15:44 +01:00
ret void
}
; CHECK: @bar2
; CHECK-NOT: movzbl
; CHECK: callq
define void @bar2(i8 zeroext %v1) nounwind ssp {
entry:
%conv = zext i8 %v1 to i32
The x86-64 ABI says that a bool is only guaranteed to be sign-extended to a byte rather than an int. Thankfully, this only causes LLVM to miss optimizations, not generate incorrect code. This just fixes the zext at the return. We still insert an i32 ZextAssert when reading a function's arguments, but it is followed by a truncate and another i8 ZextAssert so it is not optimized. llvm-svn: 127766
2011-03-16 23:20:18 +01:00
%call = tail call i32 (...)* @foo1(i32 %conv) nounwind
Add a test for i1 zeroext arguments on x86-64. We currently generate code that conforms to the ABI, but DAGCombine could in theory recognize the sequence of zext asserts and truncates and generate incorrect code. llvm-svn: 127754
2011-03-16 21:15:44 +01:00
ret void
}
The x86-64 ABI says that a bool is only guaranteed to be sign-extended to a byte rather than an int. Thankfully, this only causes LLVM to miss optimizations, not generate incorrect code. This just fixes the zext at the return. We still insert an i32 ZextAssert when reading a function's arguments, but it is followed by a truncate and another i8 ZextAssert so it is not optimized. llvm-svn: 127766
2011-03-16 23:20:18 +01:00
; CHECK: @bar3
; CHECK: callq
; CHECK-NOT: movzbl
; CHECK-NOT: and
; CHECK: ret
define zeroext i1 @bar3() nounwind ssp {
entry:
%call = call i1 @foo2() nounwind
ret i1 %call
}
declare i32 @foo1(...)
declare zeroext i1 @foo2()
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