[llvm] [GlobalISel] matchSDivByConst should use isNullValue() (PR #89666)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-globalisel

Author: AtariDreams (AtariDreams)

<details>
<summary>Changes</summary>

It has been using isZeroValue(), which is for floats, not integers.

---
Full diff: https://github.com/llvm/llvm-project/pull/89666.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp (+3-7) 


``````````diff
diff --git a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
index c5ee354f13b7b4..5545ec3b3ed0c6 100644
--- a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
@@ -5197,12 +5197,8 @@ bool CombinerHelper::matchUDivByConst(MachineInstr &MI) {
       return false;
   }
 
-  auto CheckEltValue = [&](const Constant *C) {
-    if (auto *CI = dyn_cast_or_null<ConstantInt>(C))
-      return !CI->isZero();
-    return false;
-  };
-  return matchUnaryPredicate(MRI, RHS, CheckEltValue);
+  return matchUnaryPredicate(
+      MRI, RHS, [](const Constant *C) { return C && !C->isNullValue(); });
 }
 
 void CombinerHelper::applyUDivByConst(MachineInstr &MI) {
@@ -5232,7 +5228,7 @@ bool CombinerHelper::matchSDivByConst(MachineInstr &MI) {
   // If the sdiv has an 'exact' flag we can use a simpler lowering.
   if (MI.getFlag(MachineInstr::MIFlag::IsExact)) {
     return matchUnaryPredicate(
-        MRI, RHS, [](const Constant *C) { return C && !C->isZeroValue(); });
+        MRI, RHS, [](const Constant *C) { return C && !C->isNullValue(); });
   }
 
   // Don't support the general case for now.

``````````

</details>


https://github.com/llvm/llvm-project/pull/89666