diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp index 103992de3dc0..497d0efd2719 100644 --- a/llvm/lib/Analysis/ConstantFolding.cpp +++ b/llvm/lib/Analysis/ConstantFolding.cpp @@ -671,9 +671,12 @@ Constant *llvm::ConstantFoldLoadFromConst(Constant *C, Type *Ty, // Try hard to fold loads from bitcasted strange and non-type-safe things. if (Offset.getMinSignedBits() <= 64) - return FoldReinterpretLoadFromConst(C, Ty, Offset.getSExtValue(), DL); + if (Constant *Result = + FoldReinterpretLoadFromConst(C, Ty, Offset.getSExtValue(), DL)) + return Result; - return nullptr; + // Try an offset-independent fold of a uniform value. + return ConstantFoldLoadFromUniformValue(C, Ty); } Constant *llvm::ConstantFoldLoadFromConst(Constant *C, Type *Ty, diff --git a/llvm/test/Transforms/GlobalOpt/evaluate-load-uniform.ll b/llvm/test/Transforms/GlobalOpt/evaluate-load-uniform.ll new file mode 100644 index 000000000000..ba434a9eb67c --- /dev/null +++ b/llvm/test/Transforms/GlobalOpt/evaluate-load-uniform.ll @@ -0,0 +1,20 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals +; RUN: opt -S -globalopt < %s | FileCheck %s + +; Make sure that the load from uniform value @g1 succeeds during evaluation. + +@g1 = global [2 x i64*] zeroinitializer +@g2 = global i64* inttoptr(i64 1 to i64*) + +@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @ctor, i8* null }] + +;. +; CHECK: @[[G1:[a-zA-Z0-9_$"\\.-]+]] = local_unnamed_addr global [2 x i64*] zeroinitializer +; CHECK: @[[G2:[a-zA-Z0-9_$"\\.-]+]] = local_unnamed_addr global i64* null +; CHECK: @[[LLVM_GLOBAL_CTORS:[a-zA-Z0-9_$"\\.-]+]] = appending global [0 x { i32, void ()*, i8* }] zeroinitializer +;. +define internal void @ctor() { + %v = load i64*, i64** getelementptr ([2 x i64*], [2 x i64*]* @g1, i64 0, i64 1) + store i64* %v, i64** @g2 + ret void +}