[llvm] [AMDGPU] Switch V_CNDMASK operands to shrink it into VOP2 (PR #135162)

[Mirko Brkušanin via llvm-commits]

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@@ -831,6 +836,210 @@ bool SIShrinkInstructions::tryReplaceDeadSDST(MachineInstr &MI) const {
   return true;
 }
 
+unsigned SIShrinkInstructions::getInverseCompareOpcode(MachineInstr &MI) const {
+  switch (MI.getOpcode()) {
+  // int 32
+  case AMDGPU::V_CMP_EQ_I32_e64:
+    return AMDGPU::V_CMP_NE_I32_e64;
+  case AMDGPU::V_CMP_NE_I32_e64:
+    return AMDGPU::V_CMP_EQ_I32_e64;
+  case AMDGPU::V_CMP_GE_I32_e64:
+    return AMDGPU::V_CMP_LT_I32_e64;
+  case AMDGPU::V_CMP_LE_I32_e64:
+    return AMDGPU::V_CMP_GT_I32_e64;
+  case AMDGPU::V_CMP_GT_I32_e64:
+    return AMDGPU::V_CMP_LE_I32_e64;
+  case AMDGPU::V_CMP_LT_I32_e64:
+    return AMDGPU::V_CMP_GE_I32_e64;
+  // int 64
+  case AMDGPU::V_CMP_EQ_I64_e64:
+    return AMDGPU::V_CMP_NE_I64_e64;
+  case AMDGPU::V_CMP_NE_I64_e64:
+    return AMDGPU::V_CMP_EQ_I64_e64;
+  case AMDGPU::V_CMP_GE_I64_e64:
+    return AMDGPU::V_CMP_LT_I64_e64;
+  case AMDGPU::V_CMP_LE_I64_e64:
+    return AMDGPU::V_CMP_GT_I64_e64;
+  case AMDGPU::V_CMP_GT_I64_e64:
+    return AMDGPU::V_CMP_LE_I64_e64;
+  case AMDGPU::V_CMP_LT_I64_e64:
+    return AMDGPU::V_CMP_GE_I64_e64;
+  // unsigned 32
+  case AMDGPU::V_CMP_EQ_U32_e64:
+    return AMDGPU::V_CMP_NE_U32_e64;
+  case AMDGPU::V_CMP_NE_U32_e64:
+    return AMDGPU::V_CMP_EQ_U32_e64;
+  case AMDGPU::V_CMP_GE_U32_e64:
+    return AMDGPU::V_CMP_LT_U32_e64;
+  case AMDGPU::V_CMP_LE_U32_e64:
+    return AMDGPU::V_CMP_GT_U32_e64;
+  case AMDGPU::V_CMP_GT_U32_e64:
+    return AMDGPU::V_CMP_LE_U32_e64;
+  case AMDGPU::V_CMP_LT_U32_e64:
+    return AMDGPU::V_CMP_GE_U32_e64;
+    // unsigned 64
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mbrkusanin wrote:

This comment is indented while the others are not (looks like clang-format does not complain)

https://github.com/llvm/llvm-project/pull/135162