Prevent insertion of "vzeroupper" before call that preserves YMM registers, since a caller uses preserved registers across the call.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175043 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86VZeroUpper.cpp b/lib/Target/X86/X86VZeroUpper.cpp
index c4a5887..0f77948 100644
--- a/lib/Target/X86/X86VZeroUpper.cpp
+++ b/lib/Target/X86/X86VZeroUpper.cpp
@@ -120,9 +120,19 @@
return false;
}
+static bool clobbersAllYmmRegs(const MachineOperand &MO) {
+ for (unsigned reg = X86::YMM0; reg < X86::YMM15; ++reg) {
+ if (!MO.clobbersPhysReg(reg))
+ return false;
+ }
+ return true;
+}
+
static bool hasYmmReg(MachineInstr *MI) {
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
+ if (MI->isCall() && MO.isRegMask() && !clobbersAllYmmRegs(MO))
+ return true;
if (!MO.isReg())
continue;
if (MO.isDebug())