[PATCH] D57237: [JSON] Work around excess-precision issue when comparing T_Integer numbers.
Sam McCall via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Jan 25 07:05:46 PST 2019
This revision was automatically updated to reflect the committed changes.
Closed by commit rL352204: [JSON] Work around excess-precision issue when comparing T_Integer numbers. (authored by sammccall, committed by ).
Repository:
rL LLVM
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D57237/new/
https://reviews.llvm.org/D57237
Files:
llvm/trunk/include/llvm/Support/JSON.h
llvm/trunk/lib/Support/JSON.cpp
Index: llvm/trunk/lib/Support/JSON.cpp
===================================================================
--- llvm/trunk/lib/Support/JSON.cpp
+++ llvm/trunk/lib/Support/JSON.cpp
@@ -181,6 +181,12 @@
case Value::Boolean:
return *L.getAsBoolean() == *R.getAsBoolean();
case Value::Number:
+ // Workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=323
+ // The same integer must convert to the same double, per the standard.
+ // However we see 64-vs-80-bit precision comparisons with gcc-7 -O3 -m32.
+ // So we avoid floating point promotion for exact comparisons.
+ if (L.Type == Value::T_Integer || R.Type == Value::T_Integer)
+ return L.getAsInteger() == R.getAsInteger();
return *L.getAsNumber() == *R.getAsNumber();
case Value::String:
return *L.getAsString() == *R.getAsString();
Index: llvm/trunk/include/llvm/Support/JSON.h
===================================================================
--- llvm/trunk/include/llvm/Support/JSON.h
+++ llvm/trunk/include/llvm/Support/JSON.h
@@ -480,6 +480,7 @@
mutable llvm::AlignedCharArrayUnion<bool, double, int64_t, llvm::StringRef,
std::string, json::Array, json::Object>
Union;
+ friend bool operator==(const Value &, const Value &);
};
bool operator==(const Value &, const Value &);
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