diff options
| author | M Joonas Pihlaja <jpihlaja@cc.helsinki.fi> | 2009-01-13 11:31:21 +0200 |
|---|---|---|
| committer | M Joonas Pihlaja <jpihlaja@cc.helsinki.fi> | 2009-01-13 11:31:21 +0200 |
| commit | 32ca093f19006b9beb0259237a1a4e1869f15807 (patch) | |
| tree | 56cec3bf8c1f08a9718eb0b05db8404e6f0a1d17 | |
| parent | bca43fc5c350dece7cac8a12a237e5bf37a666ed (diff) | |
[sse2-test] Identify runs of zero in the input in the single pixel cases.
| -rw-r--r-- | unpremultiply-sse2-test.S | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/unpremultiply-sse2-test.S b/unpremultiply-sse2-test.S index 4d45f7a..1fce594 100644 --- a/unpremultiply-sse2-test.S +++ b/unpremultiply-sse2-test.S @@ -75,9 +75,10 @@ unpremultiply_single_pixels: ; Extract alpha and look up the reciprocal. mov ebx, eax mov ebp, eax ; Initialise result pixel register. + and ebp, 0xFF000000 ; Mask off non-alpha from result pix. + jz .prolog shr ebx, 24 ; Load alpha. mov ebx, DWORD [reciprocal_table_D + 4*ebx] ; Load reciprocal. - and ebp, 0xFF000000 ; Mask off non-alpha from result pix. ; Do the component from bits 0..7. mov edx, eax @@ -106,8 +107,9 @@ unpremultiply_single_pixels: ; Extract alpha and loop up the reciprocal. mov ebx, eax shr eax, 8 ; Shift out alpha. - and ebx, 255 ; Mask off non-alpha. - mov ebp, ebx ; Initialise result pixel. + and ebp, 255 ; Mask off non-alpha. + mov ebx, ebp ; Initialise result pixel. + jz .prolog mov ebx, DWORD [reciprocal_table_D + 4*ebx] ; Load reciprocal. ; Do the component from bits 8..15. @@ -133,6 +135,7 @@ unpremultiply_single_pixels: shl eax, 8 or ebp, eax %endif +.prolog: ; Write the result pixel. mov [rdi + rcx*4], ebp |