[LLVM][InstCombine] foldICmpEquality: Compare APInt values rather than addresses. (#151726)

Author: paulwalker-arm

llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp

@@ -6090,7 +6090,7 @@ Instruction *InstCombinerImpl::foldICmpEquality(ICmpInst &I) {
        match(Op1, m_OneUse(m_LShr(m_Value(B), m_APIntAllowPoison(AP2))))) ||
       (match(Op0, m_OneUse(m_AShr(m_Value(A), m_APIntAllowPoison(AP1)))) &&
        match(Op1, m_OneUse(m_AShr(m_Value(B), m_APIntAllowPoison(AP2)))))) {
-    if (AP1 != AP2)
+    if (*AP1 != *AP2)
       return nullptr;
     unsigned TypeBits = AP1->getBitWidth();
     unsigned ShAmt = AP1->getLimitedValue(TypeBits);

llvm/test/Transforms/InstCombine/compare-signs.ll

@@ -1,5 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -passes=instcombine -S < %s | FileCheck %s
+; RUN: opt -passes=instcombine -use-constant-int-for-fixed-length-splat -S < %s | FileCheck %s
 
 ; PR5438