[llvm] b7ebb67 - [SCEV] Fix -Wrange-loop-construct (NFC)

[Jie Fu via llvm-commits]

Author: Jie Fu
Date: 2024-08-13T17:13:04+08:00
New Revision: b7ebb67b86888de05419e07a38b932344ac9c7a7

URL: https://github.com/llvm/llvm-project/commit/b7ebb67b86888de05419e07a38b932344ac9c7a7
DIFF: https://github.com/llvm/llvm-project/commit/b7ebb67b86888de05419e07a38b932344ac9c7a7.diff

LOG: [SCEV] Fix -Wrange-loop-construct (NFC)

/llvm-project/llvm/lib/Analysis/ScalarEvolution.cpp:12009:21:
 error: loop variable '[S, Mul]' creates a copy from type 'const value_type' (aka 'const llvm::detail::DenseMapPair<const llvm::SCEV *, int>') [-Werror,-Wrange-loop-construct]
    for (const auto [S, Mul] : Multiplicity) {
                    ^
/llvm-project/llvm/lib/Analysis/ScalarEvolution.cpp:12009:10:
 note: use reference type 'const value_type &' (aka 'const llvm::detail::DenseMapPair<const llvm::SCEV *, int> &') to prevent copying
    for (const auto [S, Mul] : Multiplicity) {
         ^~~~~~~~~~~~~~~~~~~~~
                    &

Added: 
    

Modified: 
    llvm/lib/Analysis/ScalarEvolution.cpp

Removed: 
    


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diff  --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 78975bee4d72c..9a568a252f8d2 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -12006,7 +12006,7 @@ ScalarEvolution::computeConstantDifference(const SCEV *More, const SCEV *Less) {
     // Check whether all the non-constants cancel out, or reduce to new
     // More/Less values.
     const SCEV *NewMore = nullptr, *NewLess = nullptr;
-    for (const auto [S, Mul] : Multiplicity) {
+    for (const auto &[S, Mul] : Multiplicity) {
       if (Mul == 0)
         continue;
       if (Mul == 1) {