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
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;
}