[llvm] [AMDGPU][SIInsertWaitcnts] Do not add s_waitcnt when the counters are known to be 0 already (PR #72830)

[via llvm-commits]

Juan Manuel MARTINEZ =?utf-8?q?CAAMA=C3=91O?= <juamarti at amd.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/72830 at github.com>


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@@ -886,34 +902,40 @@ bool SIInsertWaitcnts::applyPreexistingWaitcnt(
     if (II.isMetaInstruction())
       continue;
 
-    if (II.getOpcode() == AMDGPU::S_WAITCNT) {
+    unsigned Opcode = II.getOpcode();
+    bool CanFullyDiscardWaitcntSequence = SIInstrInfo::isSoftWaitcnt(Opcode);
+
+    if (SIInstrInfo::isWaitcnt(Opcode)) {
       // Conservatively update required wait if this waitcnt was added in an
       // earlier pass. In this case it will not exist in the tracked waitcnt
       // set.
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rovka wrote:

Should update this comment.

https://github.com/llvm/llvm-project/pull/72830