[llvm] [SPIR-V] Fix legalize info for G_BITREVERSE (PR #93699)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-spir-v

Author: Vyacheslav Levytskyy (VyacheslavLevytskyy)

<details>
<summary>Changes</summary>

This PR fixes legalize info for G_BITREVERSE.

---
Full diff: https://github.com/llvm/llvm-project/pull/93699.diff


2 Files Affected:

- (modified) llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp (+1-1) 
- (modified) llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp (+5) 


``````````diff
diff --git a/llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp b/llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp
index 42d36fd30ed6f..57fbf3b3f8f12 100644
--- a/llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp
@@ -182,7 +182,7 @@ SPIRVLegalizerInfo::SPIRVLegalizerInfo(const SPIRVSubtarget &ST) {
 
   getActionDefinitionsBuilder({G_LOAD, G_STORE}).legalIf(typeInSet(1, allPtrs));
 
-  getActionDefinitionsBuilder(G_BITREVERSE).legalFor(allFloatScalarsAndVectors);
+  getActionDefinitionsBuilder(G_BITREVERSE).legalFor(allIntScalarsAndVectors);
 
   getActionDefinitionsBuilder(G_FMA).legalFor(allFloatScalarsAndVectors);
 
diff --git a/llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp b/llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp
index 624899600693a..3d536085b78aa 100644
--- a/llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp
@@ -472,6 +472,11 @@ generateAssignInstrs(MachineFunction &MF, SPIRVGlobalRegistry *GR,
         insertAssignInstr(Reg, Ty, nullptr, GR, MIB, MRI);
       } else if (MIOp == TargetOpcode::G_GLOBAL_VALUE) {
         propagateSPIRVType(&MI, GR, MRI, MIB);
+      } else if (MIOp == TargetOpcode::G_BITREVERSE) {
+        Register Reg = MI.getOperand(0).getReg();
+        LLT RegType = MRI.getType(Reg);
+        if (RegType.getSizeInBits() < 32)
+          MRI.setType(Reg, LLT::scalar(32));
       }
 
       if (MII == Begin)

``````````

</details>


https://github.com/llvm/llvm-project/pull/93699