commit f36c23ba4142e9c6531fdb160c418970ea6ecbf2 Author: Jan de Mooij jdemooij@mozilla.com Date: Thu Feb 27 20:48:59 2014 +0100

Bug 977538 - Disable PGO for CanonicalizeNaN. r=luke, a=abillings --- js/public/Value.h | 7 +++++++ 1 file changed, 7 insertions(+)

diff --git a/js/public/Value.h b/js/public/Value.h index bf29457..b2bd61f 100644 --- a/js/public/Value.h +++ b/js/public/Value.h @@ -819,6 +819,10 @@ GenericNaN() return mozilla::SpecificNaN(0, 0x8000000000000ULL); }

+/* MSVC with PGO miscompiles this function. */ +#if defined(_MSC_VER) +# pragma optimize("g", off) +#endif static inline double CanonicalizeNaN(double d) { @@ -826,6 +830,9 @@ CanonicalizeNaN(double d) return GenericNaN(); return d; } +#if defined(_MSC_VER) +# pragma optimize("", on) +#endif

/* * JS::Value is the interface for a single JavaScript Engine value. A few