[llvm] [AMDGPU] Fix folding clamp into pseudo scalar instructions (PR #100568)

[Matt Arsenault via llvm-commits]

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@@ -1581,7 +1581,18 @@ bool SIFoldOperands::tryFoldClamp(MachineInstr &MI) {
 
   // Clamp is applied after omod, so it is OK if omod is set.
   DefClamp->setImm(1);
-  MRI->replaceRegWith(MI.getOperand(0).getReg(), Def->getOperand(0).getReg());
+
+  Register DefReg = Def->getOperand(0).getReg();
+  Register MIDstReg = MI.getOperand(0).getReg();
+  if (TRI->isSGPRReg(*MRI, DefReg)) {
+    // Psuedo scalar instructions have a SGPR for dst and clamp is a v_max*
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arsenm wrote:

Typo Psuedo

https://github.com/llvm/llvm-project/pull/100568