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The only way to read the eflags is using push and pop. If we don't adjust the stack then we run over the first frame index. This is not something that we want to do, so we have to make sure that our machine function does not copy the flags. If it does then we have to emit the prolog that adjusts the stack. rdar://12896831 llvm-svn: 170961
38 lines
1.5 KiB
LLVM
38 lines
1.5 KiB
LLVM
; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.7.0"
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; In the code below we need to copy the EFLAGS because of scheduling constraints.
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; When copying the EFLAGS we need to write to the stack with push/pop. This forces
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; us to emit the prolog.
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; CHECK: main
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; CHECK: subq{{.*}}rsp
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; CHECK: ret
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define i32 @main(i32 %arg, i8** %arg1) nounwind {
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bb:
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%tmp = alloca i32, align 4 ; [#uses=3 type=i32*]
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%tmp2 = alloca i32, align 4 ; [#uses=3 type=i32*]
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%tmp3 = alloca i32 ; [#uses=1 type=i32*]
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store i32 1, i32* %tmp, align 4
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store i32 1, i32* %tmp2, align 4
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br label %bb4
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bb4: ; preds = %bb4, %bb
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%tmp6 = load i32* %tmp2, align 4 ; [#uses=1 type=i32]
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%tmp7 = add i32 %tmp6, -1 ; [#uses=2 type=i32]
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store i32 %tmp7, i32* %tmp2, align 4
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%tmp8 = icmp eq i32 %tmp7, 0 ; [#uses=1 type=i1]
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%tmp9 = load i32* %tmp ; [#uses=1 type=i32]
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%tmp10 = add i32 %tmp9, -1 ; [#uses=1 type=i32]
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store i32 %tmp10, i32* %tmp3
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br i1 %tmp8, label %bb11, label %bb4
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bb11: ; preds = %bb4
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%tmp12 = load i32* %tmp, align 4 ; [#uses=1 type=i32]
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ret i32 %tmp12
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}
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