[llvm] [AMDGPU] Fold redundant inf/nan checks into frexp instructions (PR #214936)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h llvm/lib/Target/AMDGPU/SIISelLowering.cpp llvm/lib/Target/AMDGPU/SIISelLowering.h --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
index ae550ebbe..f67fe5293 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -18870,12 +18870,10 @@ SITargetLowering::performFrexpSelectCombine(SDNode *N,
 
   // Check if FrexpVal comes from amdgcn_frexp_exp or amdgcn_frexp_mant.
   SDValue FrexpInput;
-  if (!sd_match(FrexpVal,
-                m_IntrinsicWOChain<Intrinsic::amdgcn_frexp_exp>(
-                    m_Value(FrexpInput))) &&
-      !sd_match(FrexpVal,
-                m_IntrinsicWOChain<Intrinsic::amdgcn_frexp_mant>(
-                    m_Value(FrexpInput))))
+  if (!sd_match(FrexpVal, m_IntrinsicWOChain<Intrinsic::amdgcn_frexp_exp>(
+                              m_Value(FrexpInput))) &&
+      !sd_match(FrexpVal, m_IntrinsicWOChain<Intrinsic::amdgcn_frexp_mant>(
+                              m_Value(FrexpInput))))
     return SDValue();
 
   // The frexp intrinsics ignore sign, so we can strip sign ops when comparing.

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https://github.com/llvm/llvm-project/pull/214936