diff options
Diffstat (limited to 'llvm/test/CodeGen/X86/copy-eflags.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/copy-eflags.ll | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/llvm/test/CodeGen/X86/copy-eflags.ll b/llvm/test/CodeGen/X86/copy-eflags.ll index 796c1ecd8c7..d98d8a7839b 100644 --- a/llvm/test/CodeGen/X86/copy-eflags.ll +++ b/llvm/test/CodeGen/X86/copy-eflags.ll @@ -9,19 +9,22 @@ target triple = "i686-unknown-linux-gnu" @.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1 ; CHECK-LABEL: func: -; This tests whether eax is properly saved/restored around the lahf/sahf -; instruction sequences. +; This tests whether eax is properly saved/restored around the +; lahf/sahf instruction sequences. We make mem op volatile to prevent +; their reordering to avoid spills. + + define i32 @func() { entry: %bval = load i8, i8* @b %inc = add i8 %bval, 1 - store i8 %inc, i8* @b - %cval = load i32, i32* @c + store volatile i8 %inc, i8* @b + %cval = load volatile i32, i32* @c %inc1 = add nsw i32 %cval, 1 - store i32 %inc1, i32* @c - %aval = load i8, i8* @a + store volatile i32 %inc1, i32* @c + %aval = load volatile i8, i8* @a %inc2 = add i8 %aval, 1 - store i8 %inc2, i8* @a + store volatile i8 %inc2, i8* @a ; Copy flags produced by the incb of %inc1 to a register, need to save+restore ; eax around it. The flags will be reused by %tobool. ; CHECK: pushl %eax |
