Attachment 15133 Details for Bug 15018 – Enable BSR in Log2 functions

[patch] Enable BSR in Log2 functions

usr-bsr-in-log2.patch (text/plain), 961 bytes, created by Matt Turner on 2008-03-14 19:19:30 UTC

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Creator: Matt Turner

Created: 2008-03-14 19:19:30 UTC

Size: 961 bytes

patch

obsolete

>diff --git a/src/radeon_exa.c b/src/radeon_exa.c
>index 4da4841..7695f42 100644
>--- a/src/radeon_exa.c
>+++ b/src/radeon_exa.c
>@@ -99,10 +99,17 @@ static __inline__ int
> RADEONLog2(int val)
> {
> 	int bits;
>-
>+#if (defined __i386__ || defined __x86_64__) && (defined __GNUC__)
>+	__asm volatile("bsrl	%1, %0"
>+		: "=r" (bits)
>+		: "c" (val)
>+	);
>+	return bits;
>+#else
> 	for (bits = 0; val != 0; val >>= 1, ++bits)
> 		;
> 	return bits - 1;
>+#endif
> }
> 
> static __inline__ CARD32 F_TO_DW(float val)
>diff --git a/src/radeon_render.c b/src/radeon_render.c
>index a80d136..0908d20 100644
>--- a/src/radeon_render.c
>+++ b/src/radeon_render.c
>@@ -250,10 +250,17 @@ static __inline__ int
> ATILog2(int val)
> {
> 	int bits;
>-
>+#if (defined __i386__ || defined __x86_64__) && (defined __GNUC__)
>+	__asm volatile("bsrl	%1, %0"
>+		: "=r" (bits)
>+		: "c" (val)
>+	);
>+	return bits;
>+#else
> 	for (bits = 0; val != 0; val >>= 1, ++bits)
> 		;
> 	return bits - 1;
>+#endif
> }
> 
> static void

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