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authorshirosaki <shirosaki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2012-10-12 13:30:17 +0000
committershirosaki <shirosaki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2012-10-12 13:30:17 +0000
commit8d236bc0b150b531acc121d657428bf824a9ca35 (patch)
tree0ef2b6a1fcaa7fbc5bc47b6d2a4de11c862b1373 /include/ruby/win32.h
parent25a79e9f9be11f184485d3177a7ec75516d37259 (diff)
win32.h: set floating point precision for pow()
* include/ruby/win32.h (rb_w32_pow): set floating point precision for mingw-w64 x86 pow(). This improves the precision of pow() on Windows XP for TestFloat#test_round_with_precision failure. [ruby-core:47911] [Bug #7142] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37168 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'include/ruby/win32.h')
-rw-r--r--include/ruby/win32.h20
1 files changed, 19 insertions, 1 deletions
diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index 718da13..a2eec0c 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -764,7 +764,7 @@ uintptr_t rb_w32_asynchronize(asynchronous_func_t func, uintptr_t self, int argc
} /* extern "C" { */
#endif
-#ifdef __MINGW64__
+#if defined(__MINGW64__)
/*
* Use powl() instead of broken pow() of x86_64-w64-mingw32.
* This workaround will fix test failures in test_bignum.rb,
@@ -775,6 +775,24 @@ rb_w32_pow(double x, double y)
{
return powl(x, y);
}
+#elif defined(__MINGW64_VERSION_MAJOR)
+/*
+ * Set floating point precision for pow() of mingw-w64 x86.
+ * With default precision the result is not proper on WinXP.
+ */
+static inline double
+rb_w32_pow(double x, double y)
+{
+ double r;
+ unsigned int default_control = _controlfp(0, 0);
+ _controlfp(_PC_64, _MCW_PC);
+ r = pow(x, y);
+ /* Restore setting */
+ _controlfp(default_control, _MCW_PC);
+ return r;
+}
+#endif
+#if defined(__MINGW64_VERSION_MAJOR) || defined(__MINGW64__)
#define pow rb_w32_pow
#endif