llvm /
llvm /
315dff0404ad160bd8d3c6075b451f04d8f360b6 [X86] Mark FP32_TO_INT16_IN_MEM/FP32_TO_INT32_IN_MEM/FP32_TO_INT64_IN_MEM as clobbering EFLAGS to prevent mis-scheduling during conversion from SelectionDAG to MIR.
After r354178, these instruction expand to a sequence that uses an OR instruction. That OR clobbers EFLAGS so we need to state that to avoid accidentally using the clobbered flags.
Our tests show the bug, but I didn't notice because the SETcc instructions didn't move after r354178 since it used to be safe to do the fp->int conversion first.
We should probably convert this whole sequence to SelectionDAG instead of a custom inserter to avoid mistakes like this.
Fixes PR40779
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354395 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed
