[Qemu-devel] [PATCH] target-i386: Fix regression with maxsd SSE2 instruction v2

[Jason Wessel <jason.wessel@windriver.com>]

The maxsd instruction needs to take into account the sign of the
numbers 64 bit numbers.  This is a regression that was introduced in
347ac8e356 (target-i386: switch to softfloat).

The case that fails is:

maxsd  %xmm1,%xmm0

When xmm1 = 24 and xmm0 = -100

This was found running the glib2 binding tests where it prints the message:
/binding/transform:
GLib-GObject-WARNING **: value "24.000000" of type `gdouble' is invalid or out of range for property `value' of type `gdouble'
aborting...

Using a signed comparison fixes the problem.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
---
 target-i386/ops_sse.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/target-i386/ops_sse.h b/target-i386/ops_sse.h
index aa41d25..58f7bf5 100644
--- a/target-i386/ops_sse.h
+++ b/target-i386/ops_sse.h
@@ -584,8 +584,8 @@ void helper_ ## name ## sd (Reg *d, Reg *s)\
 #define FPU_SUB(size, a, b) float ## size ## _sub(a, b, &env->sse_status)
 #define FPU_MUL(size, a, b) float ## size ## _mul(a, b, &env->sse_status)
 #define FPU_DIV(size, a, b) float ## size ## _div(a, b, &env->sse_status)
-#define FPU_MIN(size, a, b) (a) < (b) ? (a) : (b)
-#define FPU_MAX(size, a, b) (a) > (b) ? (a) : (b)
+#define FPU_MIN(size, a, b) float ## size ## _lt(a, b, &env->sse_status) ? (a) : (b)
+#define FPU_MAX(size, a, b) float ## size ## _lt(b, a, &env->sse_status) ? (a) : (b)
 #define FPU_SQRT(size, a, b) float ## size ## _sqrt(b, &env->sse_status)
 
 SSE_HELPER_S(add, FPU_ADD)
-- 
1.7.1