[PATCH] [ARM] Fix vector ule zero lowering
authorDavid Green <david.green@arm.com>
Wed, 2 Nov 2022 22:34:05 +0000 (22:34 +0000)
committerGianfranco Costamagna <locutusofborg@debian.org>
Tue, 22 Nov 2022 09:58:27 +0000 (09:58 +0000)
commit63df41b384448e60f189facdad64c69b581fdf6b
tree6709a3877ab5aac6e11eae84df61d9dc6569cdcd
parenta508182d3629e90730c209a11b7cefb6fdb08c46
[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