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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-10-17 17:52:35 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-10-17 17:52:35 +0000 |
| commit | 9d57cdfa172c1af3712ef52862a1976c57c679a5 (patch) | |
| tree | 5e48b1102b923a093476f1080654085f654b72eb | |
| parent | e4b33a115bb91c663c55061fd232fa839cc8c4ca (diff) | |
| download | external_llvm-9d57cdfa172c1af3712ef52862a1976c57c679a5.tar.gz external_llvm-9d57cdfa172c1af3712ef52862a1976c57c679a5.tar.bz2 external_llvm-9d57cdfa172c1af3712ef52862a1976c57c679a5.zip | |
Check for empty YMM use-def lists in X86VZeroUpper.
The previous MRI.isPhysRegUsed(YMM0) would also return true when the
function contains a call to a function that may clobber YMM0. That's
most of them.
Checking the use-def chains allows us to skip functions that don't
explicitly mention YMM registers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166110 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/X86VZeroUpper.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Target/X86/X86VZeroUpper.cpp b/lib/Target/X86/X86VZeroUpper.cpp index 449eed3d8d..c4a58874a4 100644 --- a/lib/Target/X86/X86VZeroUpper.cpp +++ b/lib/Target/X86/X86VZeroUpper.cpp @@ -147,7 +147,7 @@ bool VZeroUpperInserter::runOnMachineFunction(MachineFunction &MF) { const TargetRegisterClass *RC = &X86::VR256RegClass; for (TargetRegisterClass::iterator i = RC->begin(), e = RC->end(); i != e; i++) { - if (MRI.isPhysRegUsed(*i)) { + if (!MRI.reg_nodbg_empty(*i)) { YMMUsed = true; break; } |