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Fix incorrect Math.pow() calculations on MinGW-w64.

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Original patch by Jonathan Liu <net147@gmail.com> https://chromiumcodereview.appspot.com/10026017/

BUG=
TEST=mjsunit/math-pow,mjsunit/math-sqrt

Review URL: https://chromiumcodereview.appspot.com/10108022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11362 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
yangguo@chromium.org 2012-04-17 16:15:20 +00:00
parent 6339bcb331
commit 661edb44de
1 changed files with 14 additions and 0 deletions
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14
src/assembler.cc
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@ -1153,6 +1153,20 @@ double power_double_int(double x, int y) {
double power_double_double(double x, double y) {
#ifdef __MINGW64_VERSION_MAJOR
// MinGW64 has a custom implementation for pow. This handles certain
// special cases that are different.
if ((x == 0.0 || isinf(x)) && isfinite(y)) {
double f;
if (modf(y, &f) != 0.0) return ((x == 0.0) ^ (y > 0)) ? V8_INFINITY : 0;
}
if (x == 2.0) {
int y_int = static_cast<int>(y);
if (y == y_int) return ldexp(1.0, y);
}
#endif
// The checks for special cases can be dropped in ia32 because it has already
// been done in generated code before bailing out here.
if (isnan(y) || ((x == 1 || x == -1) && isinf(y))) return OS::nan_value();