[PATCH] D109099: [AMDGPU] Use S_BITCMP0_* to replace AND in optimizeCompareInstr

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec created this revision.
rampitec added reviewers: arsenm, alex-t, foad.
Herald added subscribers: kerbowa, hiraditya, t-tye, tpr, dstuttard, yaxunl, nhaehnle, jvesely, kzhuravl.
rampitec requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

These can be used for reversed conditions if result of the AND
is unused except in the compare:

s_cmp_eq_u32 (s_and_b32 $src, 1), 0 => s_bitcmp0_b32 $src, 0
s_cmp_eq_i32 (s_and_b32 $src, 1), 0 => s_bitcmp0_b32 $src, 0
s_cmp_eq_u64 (s_and_b64 $src, 1), 0 => s_bitcmp0_b64 $src, 0
s_cmp_lg_u32 (s_and_b32 $src, 1), 1 => s_bitcmp0_b32 $src, 0
s_cmp_lg_i32 (s_and_b32 $src, 1), 1 => s_bitcmp0_b32 $src, 0
s_cmp_lg_u64 (s_and_b64 $src, 1), 1 => s_bitcmp0_b64 $src, 0


https://reviews.llvm.org/D109099

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/test/CodeGen/AMDGPU/optimize-compare.mir

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D109099.370080.patch
Type: text/x-patch
Size: 13716 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20210901/da0e66c0/attachment-0001.bin>