[gentoo-dev] arithmetic exception in XFree with sse instructions

[gentoo-dev] arithmetic exception in XFree with sse instructions

[Frederick Grim]

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Howdy,

	There is a problem in the mesa code in xfree that popped up when I was using some
mesh generating software.  This fix was commited by Linus to mesalib but hasn't made it
into xfree.  Since the problem arose for me I suppose some else has caught it as well.
Hence the patch.

				Fred
-- 
#!/usr/bin/perl -sp0777i<X+d*lMLa^*lN%0]dsXx++lMlN/dsM0<j]dsj $/=unpack('H*',$_);$_=`echo
16dio\U$k"SK$/SM$n\EsN0p[lN*1 lK[d2%Sa2/d0$^Ixp"|dc`;s/\W//g;$_=pack('H*',/((..)*)$/)

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diff -urN xc/extras/Mesa/src/X86/common_x86_asm.S xc.new/extras/Mesa/src/X86/common_x86_asm.S
--- xc/extras/Mesa/src/X86/common_x86_asm.S	2002-12-16 11:18:33.000000000 -0500
+++ xc.new/extras/Mesa/src/X86/common_x86_asm.S	2003-08-28 15:12:28.000000000 -0400
@@ -64,11 +64,6 @@
 GLNAME( found_intel ):	STRING( "Genuine Intel processor found\n\0" )
 GLNAME( found_amd ):	STRING( "Authentic AMD processor found\n\0" )
 
-#ifdef USE_SSE_ASM
-GLNAME( sse_test_dummy ):
-	D_LONG 0x3f800000, 0x3f800000, 0x3f800000, 0x3f800000
-#endif
-
 
 	SEG_TEXT
 
@@ -118,10 +113,10 @@
 	CPUID
 	MOV_L	( EDX, EAX )
 
-	/* Mask out highest bit, which is used by AMD for 3dnow.
-	 * Newer Intel have this bit set, but do not support 3dnow.
-	 */
-	AND_L	( CONST(0X7FFFFFFF), EAX)
+	/* Mask out highest bit, which is used by AMD for 3dnow
+         * Newer Intel have this bit set, but do not support 3dnow 
+ 	 */
+        AND_L   ( CONST(0X7FFFFFFF), EAX)
 	JMP	( LLBL(cpuid_done) )
 
 LLBL(cpuid_amd):
@@ -222,7 +217,13 @@
 	LDMXCSR	( REGOFF( -8, EBP ) )
 
 	XORPS	( XMM0, XMM0 )
-	MOVUPS	( CONTENT( GLNAME( sse_test_dummy ) ), XMM1 )
+
+	PUSH_L	( CONST( 0x3f800000 ) )
+	PUSH_L	( CONST( 0x3f800000 ) )
+	PUSH_L	( CONST( 0x3f800000 ) )
+	PUSH_L	( CONST( 0x3f800000 ) )
+
+	MOVUPS	( REGIND( ESP ), XMM1 )
 
 	DIVPS	( XMM0, XMM1 )
 

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