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[AArch64ConditionalCompares] Ignore debug insts in findConvertibleCompare [8/14]

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Summary:
Fix an issue where the presence of debug info could disable the ccmp
optimization due to findConvertibleCompare failing too early (the error
is "Can't create ccmp with multiple uses", where the "use" is a
DBG_VALUE inst).

Depends on D78151.

Reviewers: t.p.northover, paquette, aemerson

Subscribers: kristof.beyls, hiraditya, danielkiss, aprantl, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D78156
This commit is contained in:
Vedant Kumar 2020-04-14 14:27:48 -07:00
parent ee83cda2e4
commit def70b77f9
2 changed files with 2 additions and 2 deletions
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2
lib/Target/AArch64/AArch64ConditionalCompares.cpp
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@ -317,7 +317,7 @@ MachineInstr *SSACCmpConv::findConvertibleCompare(MachineBasicBlock *MBB) {
// Now find the instruction controlling the terminator.
for (MachineBasicBlock::iterator B = MBB->begin(); I != B;) {
--I;
I = prev_nodbg(I, MBB->begin());
assert(!I->isTerminator() && "Spurious terminator");
switch (I->getOpcode()) {
// cmp is an alias for subs with a dead destination register.

2
test/CodeGen/AArch64/arm64-ccmp.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -mcpu=cyclone -verify-machineinstrs -aarch64-enable-ccmp -aarch64-stress-ccmp | FileCheck %s
; RUN: llc < %s -debugify-and-strip-all-safe -mcpu=cyclone -verify-machineinstrs -aarch64-enable-ccmp -aarch64-stress-ccmp | FileCheck %s
target triple = "arm64-apple-ios"
; CHECK: single_same