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save one cycle

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Originally committed as revision 7799 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2007-02-01 22:50:38 +00:00
parent 173fd724f5
commit ac62b62600
1 changed files with 6 additions and 2 deletions
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8
libavcodec/armv4l/simple_idct_armv6.S
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@ -51,13 +51,13 @@ w57: .long W57
Compute partial IDCT of single row.
shift = left-shift amount
a1 = source address
a3 = row[2,0]
a3 = row[2,0] <= 2 cycles
a4 = row[3,1]
ip = w42 <= 2 cycles
Output in registers v1--v8
*/
.macro idct_row shift
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
ldr lr, [pc, #(w46-.-8)] /* lr = W4 | (W6 << 16) */
mov a2, #(1<<(\shift-1))
smlad v1, a3, ip, a2
@ -204,6 +204,7 @@ idct_row_armv6:
cmpeq lr, a3, lsr #16
beq 1f
str a2, [sp, #-4]!
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
cmp lr, #0
beq 2f
@ -249,6 +250,7 @@ idct_col_armv6:
stmfd sp!, {a2, lr}
ldr a3, [a1] /* a3 = row[2,0] */
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
ldr a4, [a1, #8] /* a4 = row[3,1] */
idct_row COL_SHIFT
ldr a2, [sp], #4
@ -278,6 +280,7 @@ idct_col_put_armv6:
stmfd sp!, {a2, a3, lr}
ldr a3, [a1] /* a3 = row[2,0] */
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
ldr a4, [a1, #8] /* a4 = row[3,1] */
idct_row COL_SHIFT
ldmfd sp!, {a2, a3}
@ -309,6 +312,7 @@ idct_col_add_armv6:
stmfd sp!, {a2, a3, lr}
ldr a3, [a1] /* a3 = row[2,0] */
ldr ip, [pc, #(w42-.-8)] /* ip = W4 | (W2 << 16) */
ldr a4, [a1, #8] /* a4 = row[3,1] */
idct_row COL_SHIFT
ldmfd sp!, {a2, a3}