[PATCH] [ARM] Fix vector ule zero lowering
authorDavid Green <david.green@arm.com>
Wed, 2 Nov 2022 22:34:05 +0000 (22:34 +0000)
committerSylvestre Ledru <sylvestre@debian.org>
Sun, 1 Jan 2023 14:46:39 +0000 (14:46 +0000)
commit73bacc5474a9bb456fb8685618ea68b77e08bbac
treee330a59d446f31c291297a7563070679d94b479c
parentb628f19c1b8bc2c6e0b7103d88fa831afe8822b7
[PATCH] [ARM] Fix vector ule zero lowering

The instruction icmp ule <4 x i32> %0, zeroinitializer will usually be
simplified to icmp eq <4 x i32> %0, zeroinitializer. It is not
guaranteed though, and the code for lowering vector compares could pick
the wrong form of the instruction if this happened. I've tried to make
the code more explicit about the supported conditions.

This fixes NEON being unable to select VCMPZ with HS conditions, and
fixes some incorrect MVE patterns.

Fixes #58514.

Differential Revision: https://reviews.llvm.org/D136447

Gbp-Pq: Name fix-mesa-build.patch
llvm/lib/Target/ARM/ARMISelLowering.cpp
llvm/test/CodeGen/ARM/vcmpz.ll
llvm/test/CodeGen/Thumb2/mve-pred-and.ll
llvm/test/CodeGen/Thumb2/mve-pred-or.ll
llvm/test/CodeGen/Thumb2/mve-pred-xor.ll
llvm/test/CodeGen/Thumb2/mve-vcmpz.ll