[PATCH] PPC Fix bug in altivec emulation

[Paul Mackerras]

This patch fixes a bug in the kernel emulation of altivec instructions
with denormalized operands.  The emulation of the vmaddfp and vmnsubfp
instructions was giving the wrong answer because I had the wrong order
of operands to the fmadds and fnmsubs instructions.  This patch fixes
it for both ppc32 and ppc64.

Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>

diff -urN linux-2.5/arch/ppc/kernel/vector.S ppc64/arch/ppc/kernel/vector.S
--- linux-2.5/arch/ppc/kernel/vector.S	2004-05-19 00:48:08.000000000 +1000
+++ ppc64/arch/ppc/kernel/vector.S	2004-08-17 15:23:20.908955312 +1000
@@ -106,7 +106,7 @@
 1:	lfsx	fr0,r4,r7
 	lfsx	fr1,r5,r7
 	lfsx	fr2,r6,r7
-	fmadds	fr0,fr0,fr1,fr2
+	fmadds	fr0,fr0,fr2,fr1
 	stfsx	fr0,r3,r7
 	addi	r7,r7,4
 	bdnz	1b
@@ -133,7 +133,7 @@
 1:	lfsx	fr0,r4,r7
 	lfsx	fr1,r5,r7
 	lfsx	fr2,r6,r7
-	fnmsubs	fr0,fr0,fr1,fr2
+	fnmsubs	fr0,fr0,fr2,fr1
 	stfsx	fr0,r3,r7
 	addi	r7,r7,4
 	bdnz	1b
diff -urN linux-2.5/arch/ppc64/kernel/vector.S ppc64/arch/ppc64/kernel/vector.S
--- linux-2.5/arch/ppc64/kernel/vector.S	2004-06-23 12:52:07.000000000 +1000
+++ ppc64/arch/ppc64/kernel/vector.S	2004-08-17 13:22:18.000000000 +1000
@@ -89,7 +89,7 @@
 1:	lfsx	fr0,r4,r7
 	lfsx	fr1,r5,r7
 	lfsx	fr2,r6,r7
-	fmadds	fr0,fr0,fr1,fr2
+	fmadds	fr0,fr0,fr2,fr1
 	stfsx	fr0,r3,r7
 	addi	r7,r7,4
 	bdnz	1b
@@ -109,7 +109,7 @@
 1:	lfsx	fr0,r4,r7
 	lfsx	fr1,r5,r7
 	lfsx	fr2,r6,r7
-	fnmsubs	fr0,fr0,fr1,fr2
+	fnmsubs	fr0,fr0,fr2,fr1
 	stfsx	fr0,r3,r7
 	addi	r7,r7,4
 	bdnz	1b
-
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