math/mpx-mul4-amd64-sse2.S: Fix stack-argument offset for 64-bit Windows.

I failed to account for either the 160 bytes of saved XMM registers
(because the stupid ABI demands that XMM6--XMM15 be preserved across
calls), or for the daft 32-byte shadow space between the return address
and the stacked arguments.

diff --git a/math/mpx-mul4-amd64-sse2.S b/math/mpx-mul4-amd64-sse2.S
index 2d78a99..098de45 100644 (file)
--- a/math/mpx-mul4-amd64-sse2.S
+++ b/math/mpx-mul4-amd64-sse2.S
@@ -1308,7 +1308,7 @@ ENDFUNC
 #  define ARG6 STKARG(2)
 #  define ARG7 STKARG(3)
 #  define ARG8 STKARG(4)
-#  define STKARG_OFFSET 40
+#  define STKARG_OFFSET 224
 #endif
 #define STKARG(i) [rsp + STKARG_OFFSET + 8*(i)]