Mesa (master): swrast/sse: Fix _mesa_sse_transform_pointsX_3d_no_rot

[Pauli Nieminen]

Module: Mesa
Branch: master
Commit: f1b07f0220bd71c86c977ba04cf20cf90d5e8958
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f1b07f0220bd71c86c977ba04cf20cf90d5e8958

Author: Pauli Nieminen <suokkos at gmail.com>
Date:   Tue Feb  2 20:50:22 2010 +0200

swrast/sse: Fix _mesa_sse_transform_pointsX_3d_no_rot

PXOR user in code were causing the lowest SP float register to have NaN
values which made all math operations in that slot fail. Correct istruction
to clear float registers is XORPS which handles single precission floats
correctly.

Fixes progs/tests/fog in swrast SSE mode.

Now the correct commit instead of 66d09e4a2a6b770ddb which is not even close
of correct fix for the bug.

---

 src/mesa/x86/sse_xform2.S |    1 +
 src/mesa/x86/sse_xform3.S |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/mesa/x86/sse_xform2.S b/src/mesa/x86/sse_xform2.S
index 91b82e7..a443dad 100644
--- a/src/mesa/x86/sse_xform2.S
+++ b/src/mesa/x86/sse_xform2.S
@@ -186,6 +186,7 @@ GLNAME(_mesa_sse_transform_points2_3d_no_rot):
     MOV_L( REGOFF(V4F_START, EDI), EDI ) 	/* ptr to first dest vertex */
     ADD_L( EDI, ECX ) 				/* count += dest ptr */
 
+    XORPS( XMM0, XMM0 )                         /* clean the working register */
 
 ALIGNTEXT32
     MOVSS    ( M(0), XMM1 )			/* - | - |  -  | m0  */
diff --git a/src/mesa/x86/sse_xform3.S b/src/mesa/x86/sse_xform3.S
index 1fc79ef..4bc22d8 100644
--- a/src/mesa/x86/sse_xform3.S
+++ b/src/mesa/x86/sse_xform3.S
@@ -198,6 +198,7 @@ GLNAME(_mesa_sse_transform_points3_3d_no_rot):
     MOV_L( REGOFF(V4F_START, EDI), EDI ) 	/* ptr to first dest vertex */
     ADD_L( EDI, ECX ) 				/* count += dest ptr */
 
+    XORPS( XMM0, XMM0 )                         /* clean the working register */
 
 ALIGNTEXT32
     MOVSS    ( M(0), XMM1 )			/* - | - |  -  | m0  */