[PATCH] D121415: [FunctionAttrs] Infer argmemonly .

Mon Mar 28 08:33:57 PDT 2022

fhahn added a comment.

In D121415#3411555 <https://reviews.llvm.org/D121415#3411555>, @akdandrea wrote:

> In D121415#3411543 <https://reviews.llvm.org/D121415#3411543>, @fhahn wrote:
>
>> In D121415#3411483 <https://reviews.llvm.org/D121415#3411483>, @akdandrea wrote:
>>
>>> Ah that's interesting that you couldn't reproduce it on x86.  I did this test on a RHEL 8.4 Power system.  Here was how I compiled and ran the test:
>>>
>>>   clang  -flto    -O3 -DNDEBUG   -w -Werror=date-time -ffp-contract=off -ffp-contract=off -DFMA_DISABLED=1 -ffp-contract=off -DFMA_DISABLED=1 -o linpack-pc.c.o   -c test-suite/SingleSource/Benchmarks/Linpack/linpack-pc.c
>>>   clang -flto    -O3 -DNDEBUG      linpack-pc.c.o  -o linpack-pc  -lm
>>
>> I am unable to build for PowerPC. Could you share `  linpack-pc.c.o `?
>
> Sure, here it is:
> F22579002: linpack-pc.c.o <https://reviews.llvm.org/F22579002>

Looks like the issue is already happening when preparing for LTO. Could you also share the original input IR, before optimizations (passing `-emit-llvm -mllvm -disable-llvm-optzns` to the first clang invocation)?

Repository:
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https://reviews.llvm.org/D121415