[llvm] [AMDGPU][WIP] Optimize SGPR spills (PR #93668)

[Christudasan Devadasan via llvm-commits]

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@@ -1775,8 +1775,10 @@ bool SIRegisterInfo::spillSGPR(MachineBasicBlock::iterator MI, int Index,
 
   if (SpillToVGPR) {
 
-    assert(SB.NumSubRegs == VGPRSpills.size() &&
-           "Num of VGPR lanes should be equal to num of SGPRs spilled");
+    assert(SB.NumSubRegs <= VGPRSpills.size() &&
+           "Num of VGPR lanes should be greater or equal to num of SGPRs "
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cdevadas wrote:

Keep this string as concise as possible. Any extra details you want to add should be included in a comment statement before the assert. The original string looks good. You might want to change "should be equal to" -> "should be less or equal to".

https://github.com/llvm/llvm-project/pull/93668