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chromium/chromium-61.0.3163.79-MOAR-...

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diff -up chromium-61.0.3163.79/base/numerics/safe_math_clang_gcc_impl.h.fixgccagain chromium-61.0.3163.79/base/numerics/safe_math_clang_gcc_impl.h
--- chromium-61.0.3163.79/base/numerics/safe_math_clang_gcc_impl.h.fixgccagain 2017-09-06 15:48:27.560803028 -0400
+++ chromium-61.0.3163.79/base/numerics/safe_math_clang_gcc_impl.h 2017-09-06 15:50:08.715853695 -0400
@@ -126,6 +126,7 @@ struct ClampedAddFastOp {
}
};
+#if defined(__clang__) // Not supported on GCC.
// This is the fastest negation on Intel, and a decent fallback on arm.
__attribute__((always_inline)) inline int8_t ClampedNegate(uint8_t value) {
uint8_t carry;
@@ -169,6 +170,7 @@ __attribute__((always_inline)) inline in
__attribute__((always_inline)) inline int64_t ClampedNegate(int64_t value) {
return ClampedNegate(static_cast<uint64_t>(value));
}
+#endif
template <typename T, typename U>
struct ClampedSubFastOp {
@@ -180,6 +182,7 @@ struct ClampedSubFastOp {
return ClampedSubFastAsmOp<T, U>::template Do<V>(x, y);
}
+#if defined(__clang__) // Not supported on GCC.
// Fast path for generic clamped negation.
if (std::is_same<T, U>::value && std::is_same<U, V>::value &&
IsCompileTimeConstant(x) && x == 0 && !IsCompileTimeConstant(y)) {
@@ -190,6 +193,7 @@ struct ClampedSubFastOp {
IntegerBitsPlusSign<T>::value, std::is_signed<T>::value>::type>(
y));
}
+#endif
V result;
return !__builtin_sub_overflow(x, y, &result)