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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2011-11-22 06:27:18 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2011-11-22 06:27:18 +0000 |
| commit | 254a13282c97469973b4fa8cc0e110ed6160642c (patch) | |
| tree | 34776d98c4d2a651d258c26554589144cb2521c1 /test | |
| parent | f7de577a08a705970f0fd8f3c1bb40f7040e4476 (diff) | |
| download | llvm-254a13282c97469973b4fa8cc0e110ed6160642c.tar.gz llvm-254a13282c97469973b4fa8cc0e110ed6160642c.tar.bz2 llvm-254a13282c97469973b4fa8cc0e110ed6160642c.tar.xz | |
If a register is both an early clobber and part of a tied use, handle the use
before the clobber so that we copy the value if needed.
Fixes pr11415.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145056 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/X86/pr11415.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/test/CodeGen/X86/pr11415.ll b/test/CodeGen/X86/pr11415.ll new file mode 100644 index 0000000000..92c530bb9e --- /dev/null +++ b/test/CodeGen/X86/pr11415.ll @@ -0,0 +1,23 @@ +; RUN: llc %s -o - -regalloc=fast | FileCheck %s + +; We used to consider the early clobber in the second asm statement as +; defining %0 before it was read. This caused us to omit the +; movq -8(%rsp), %rdx + +; CHECK: #APP +; CHECK-NEXT: #NO_APP +; CHECK-NEXT: movq %rcx, %rax +; CHECK-NEXT: movq %rax, -8(%rsp) +; CHECK-NEXT: movq -8(%rsp), %rdx +; CHECK-NEXT: #APP +; CHECK-NEXT: #NO_APP +; CHECK-NEXT: movq %rdx, %rax +; CHECK-NEXT: movq %rdx, -8(%rsp) +; CHECK-NEXT: ret + +define i64 @foo() { +entry: + %0 = tail call i64 asm "", "={cx}"() nounwind + %1 = tail call i64 asm "", "=&r,0,r,~{rax}"(i64 %0, i64 %0) nounwind + ret i64 %1 +} |