runtime: fix a comment regarding default floating point precision
The expected precision setting for the x87 on Win32 is 53-bit
but MinGW resets the floating point unit to 64-bit. Win32
object code generally expects values to be rounded to double,
not double extended, precision.
R=golang-dev, khr
CC=golang-dev
https://golang.org/cl/8175044
diff --git a/src/pkg/runtime/asm_386.s b/src/pkg/runtime/asm_386.s
index 805405a..57de87b 100644
--- a/src/pkg/runtime/asm_386.s
+++ b/src/pkg/runtime/asm_386.s
@@ -108,7 +108,7 @@
RET
TEXT runtime·asminit(SB),7,$0
- // Linux, Windows start the FPU in extended double precision.
+ // Linux and MinGW start the FPU in extended double precision.
// Other operating systems use double precision.
// Change to double precision to match them,
// and to match other hardware that only has double.
