# This patch is required to compile avx512 targets with -O0

Commit 85726bbcbaa04d66d7a567c653b277aa4e96fb9b Mon Sep 17 00:00:00 2001

Author: Craig Topper <[email protected]>

Date: Mon, 16 Mar 2020 17:58:19 -0700

Subject: [X86] Disable fast-isel call lowering for functions with vXi1

arguments on avx512.

This fails an assert because the type is marked in the calling

convention td file as needing promotion, but the code doesn't know

how to do it.

It also much more complicated because we try to pass these in

xmm/ymm/zmm registers. As of a few weeks ago we do this promotion

from getRegisterTypeForCallingConv before the td file generated

code gets involved.

diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp

index 027e2c2d45a..c25785b9000 100644

--- a/llvm/lib/Target/X86/X86FastISel.cpp

+++ b/llvm/lib/Target/X86/X86FastISel.cpp

@@ -3289,7 +3289,8 @@ bool X86FastISel::fastLowerCall(CallLoweringInfo &CLI) {

ResultReg =

fastEmit_ri(VT, VT, ISD::AND, ResultReg, hasTrivialKill(PrevVal), 1);

} else {

- if (!isTypeLegal(Val->getType(), VT))

+ if (!isTypeLegal(Val->getType(), VT) ||

+ (VT.isVector() && VT.getVectorElementType() == MVT::i1))

return false;

ResultReg = getRegForValue(Val);

}