[Qemu-devel] [PATCH 1/4] target-i386: fix {min, max}{pd, ps, sd, ss} SSE2 instructions

[Aurelien Jarno <aurelien@aurel32.net>]

minpd, minps, minsd, minss and maxpd, maxps, maxsd, maxss SSE2
instructions have been broken when switching target-i386 to softfloat.
It's not possible to use comparison instructions on float types anymore
to softfloat, so use the floatXX_min anf floatXX_max functions instead.

As a bonus it implements the correct NaNs behaviour, so let's remove
this from the TODO.

It fixes GDM screen display on Debian Lenny.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 target-i386/TODO      |    1 -
 target-i386/ops_sse.h |    4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/target-i386/TODO b/target-i386/TODO
index c8ada07..a8d69cf 100644
--- a/target-i386/TODO
+++ b/target-i386/TODO
@@ -15,7 +15,6 @@ Correctness issues:
 - DRx register support
 - CR0.AC emulation
 - SSE alignment checks
-- fix SSE min/max with nans
 
 Optimizations/Features:
 
diff --git a/target-i386/ops_sse.h b/target-i386/ops_sse.h
index 47dde78..a743c85 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 ## _min(a, b, &env->sse_status)
+#define FPU_MAX(size, a, b) float ## size ## _max(a, b, &env->sse_status)
 #define FPU_SQRT(size, a, b) float ## size ## _sqrt(b, &env->sse_status)
 
 SSE_HELPER_S(add, FPU_ADD)
-- 
1.7.7.3