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Fix long-standing FP exception bug in _mesa_x86_cliptest_points4().

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This commit is contained in:
Gareth Hughes 2001-05-13 18:55:15 +00:00
parent d29e9dfe93
commit 53e4ebd4e3
2 changed files with 17 additions and 5 deletions
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3
src/mesa/x86/x86.c
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@ -1,4 +1,4 @@
/* $Id: x86.c,v 1.21 2001/03/30 14:44:43 gareth Exp $ */
/* $Id: x86.c,v 1.22 2001/05/13 18:55:15 gareth Exp $ */
/*
* Mesa 3-D graphics library
@ -85,7 +85,6 @@ void _mesa_init_x86_transform_asm( void )
ASSIGN_XFORM_GROUP( x86, 3 );
ASSIGN_XFORM_GROUP( x86, 4 );
/* XXX this function has been found to cause FP overflow exceptions */
_mesa_clip_tab[4] = _mesa_x86_cliptest_points4;
_mesa_clip_np_tab[4] = _mesa_x86_cliptest_points4_np;

19
src/mesa/x86/x86_cliptest.S
View file

@ -1,4 +1,4 @@
/* $Id: x86_cliptest.S,v 1.6 2001/03/28 20:44:44 gareth Exp $ */
/* $Id: x86_cliptest.S,v 1.7 2001/05/13 18:55:15 gareth Exp $ */
/*
* Mesa 3-D graphics library
@ -149,7 +149,12 @@ LLBL( ctp4_clip_table_ready ):
ALIGNTEXT16
LLBL( ctp4_top ):
FLD1 /* F3 */
MOV_L( SRC(3), ECX )
FLD1 /* F3 */
TEST_L( ECX, ECX ) /* GH: If src[3] is zero, abort */
JZ( LLBL( ctp4_noproj ) )
FDIV_S( SRC(3) )
MOV_L( SRC(3), EBP )
@ -198,7 +203,15 @@ LLBL( ctp4_top ):
JZ( LLBL( ctp4_proj ) )
FSTP( ST(0) ) /* */
LLBL( ctp4_noproj ):
FLDZ /* F0 F3 */
FST_S( DST(0) ) /* F0 F3 */
FST_S( DST(1) ) /* F0 F3 */
FSTP_S( DST(2) ) /* F3 */
FSTP_S( DST(3) ) /* */
JMP( LLBL( ctp4_next ) )
LLBL( ctp4_proj ):