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author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-06-15 16:20:57 +0000 |
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committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-06-15 16:20:57 +0000 |
commit | 75ac4d9c2dfb22f84da25dec03df7a07f3dad1fa (patch) | |
tree | eb321bdb0c71a18d3b941bcf8440fee2b8b5d231 /test | |
parent | 40d07bbebbe73914af28be1bdab169ce8333adca (diff) | |
download | llvm-75ac4d9c2dfb22f84da25dec03df7a07f3dad1fa.tar.gz llvm-75ac4d9c2dfb22f84da25dec03df7a07f3dad1fa.tar.bz2 llvm-75ac4d9c2dfb22f84da25dec03df7a07f3dad1fa.tar.xz |
Avoid processing early clobbers twice in RegAllocFast.
Early clobbers defining a virtual register were first alocated to a physreg and
then processed as a physreg EC, spilling the virtreg.
This fixes PR7382.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105998 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r-- | test/CodeGen/X86/2010-06-15-FastAllocEarlyCLobber.ll | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2010-06-15-FastAllocEarlyCLobber.ll b/test/CodeGen/X86/2010-06-15-FastAllocEarlyCLobber.ll new file mode 100644 index 0000000000..4639866afc --- /dev/null +++ b/test/CodeGen/X86/2010-06-15-FastAllocEarlyCLobber.ll @@ -0,0 +1,29 @@ +; RUN: llc -regalloc=fast < %s | FileCheck %s +; PR7382 +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" +target triple = "x86_64-unknown-linux-gnu" + +@.str = private constant [23 x i8] c"This should be -1: %d\0A\00" ; <[23 x i8]*> [#uses=1] + +define i32 @main() { +entry: + %retval = alloca i32, align 4 ; <i32*> [#uses=3] + %v = alloca i32, align 4 ; <i32*> [#uses=3] + store i32 0, i32* %retval + %zero = load i32* %retval +; The earlyclobber register EC0 should not be spilled before the inline asm. +; Yes, check-not can refer to FileCheck variables defined in the future. +; CHECK-NOT: [[EC0]]{{.*}}(%rsp) +; CHECK: bsr {{[^,]*}}, [[EC0:%...]] + %0 = call i32 asm "bsr $1, $0\0A\09cmovz $2, $0", "=&r,ro,r,~{cc},~{dirflag},~{fpsr},~{flags}"(i32 %zero, i32 -1) nounwind, !srcloc !0 ; <i32> [#uses=1] + store i32 %0, i32* %v + %tmp = load i32* %v ; <i32> [#uses=1] + %call1 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([23 x i8]* @.str, i32 0, i32 0), i32 %tmp) ; <i32> [#uses=0] + store i32 0, i32* %retval + %1 = load i32* %retval ; <i32> [#uses=1] + ret i32 %0 +} + +declare i32 @printf(i8*, ...) + +!0 = metadata !{i32 191} |