diff options
Diffstat (limited to 'libavcodec/arm/jrevdct_arm.S')
| -rw-r--r-- | libavcodec/arm/jrevdct_arm.S | 31 |
1 files changed, 13 insertions, 18 deletions
diff --git a/libavcodec/arm/jrevdct_arm.S b/libavcodec/arm/jrevdct_arm.S index 4fcf35101d..93cbbbe8eb 100644 --- a/libavcodec/arm/jrevdct_arm.S +++ b/libavcodec/arm/jrevdct_arm.S @@ -54,18 +54,13 @@ #define FIX_M_1_961570560_ID 40 #define FIX_M_2_562915447_ID 44 #define FIX_0xFFFF_ID 48 - .text - .align function ff_j_rev_dct_arm, export=1 - stmdb sp!, { r4 - r12, lr } @ all callee saved regs - - sub sp, sp, #4 @ reserve some space on the stack - str r0, [ sp ] @ save the DCT pointer to the stack + push {r0, r4 - r11, lr} mov lr, r0 @ lr = pointer to the current row mov r12, #8 @ r12 = row-counter - adr r11, const_array @ r11 = base pointer to the constants array + movrel r11, const_array @ r11 = base pointer to the constants array row_loop: ldrsh r0, [lr, # 0] @ r0 = 'd0' ldrsh r2, [lr, # 2] @ r2 = 'd2' @@ -102,7 +97,7 @@ row_loop: add r4, r6, r3, lsl #13 @ r4 = tmp11 rsb r3, r6, r3, lsl #13 @ r3 = tmp12 - stmdb sp!, { r0, r2, r3, r4 } @ save on the stack tmp10, tmp13, tmp12, tmp11 + push {r0, r2, r3, r4} @ save on the stack tmp10, tmp13, tmp12, tmp11 ldrsh r3, [lr, #10] @ r3 = 'd3' ldrsh r5, [lr, #12] @ r5 = 'd5' @@ -136,8 +131,8 @@ row_loop: add r3, r3, r4 @ r3 = tmp2 add r1, r1, r6 @ r1 = tmp3 - ldmia sp!, { r0, r2, r4, r6 } @ r0 = tmp10 / r2 = tmp13 / r4 = tmp12 / r6 = tmp11 - @ r1 = tmp3 / r3 = tmp2 / r5 = tmp1 / r7 = tmp0 + pop {r0, r2, r4, r6} @ r0 = tmp10 / r2 = tmp13 / r4 = tmp12 / r6 = tmp11 + @ r1 = tmp3 / r3 = tmp2 / r5 = tmp1 / r7 = tmp0 @ Compute DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS) add r8, r0, r1 @@ -211,7 +206,7 @@ end_of_row_loop: start_column_loop: @ Start of column loop - ldr lr, [ sp ] + pop {lr} mov r12, #8 column_loop: ldrsh r0, [lr, #( 0*8)] @ r0 = 'd0' @@ -245,7 +240,7 @@ column_loop: orrs r10, r9, r10 beq empty_odd_column - stmdb sp!, { r0, r2, r4, r6 } @ save on the stack tmp10, tmp13, tmp12, tmp11 + push {r0, r2, r4, r6} @ save on the stack tmp10, tmp13, tmp12, tmp11 add r0, r3, r5 @ r0 = 'z2' add r2, r1, r7 @ r2 = 'z1' @@ -275,8 +270,8 @@ column_loop: add r3, r3, r4 @ r3 = tmp2 add r1, r1, r6 @ r1 = tmp3 - ldmia sp!, { r0, r2, r4, r6 } @ r0 = tmp10 / r2 = tmp13 / r4 = tmp11 / r6 = tmp12 - @ r1 = tmp3 / r3 = tmp2 / r5 = tmp1 / r7 = tmp0 + pop {r0, r2, r4, r6} @ r0 = tmp10 / r2 = tmp13 / r4 = tmp11 / r6 = tmp12 + @ r1 = tmp3 / r3 = tmp2 / r5 = tmp1 / r7 = tmp0 @ Compute DESCALE(tmp10 + tmp3, CONST_BITS+PASS1_BITS+3) add r8, r0, r1 @@ -368,11 +363,10 @@ empty_odd_column: the_end: @ The end.... - add sp, sp, #4 - ldmia sp!, { r4 - r12, pc } @ restore callee saved regs and return + pop {r4 - r11, pc} +endfunc -const_array: - .align +const const_array .word FIX_0_298631336 .word FIX_0_541196100 .word FIX_0_765366865 @@ -386,3 +380,4 @@ const_array: .word FIX_M_1_961570560 .word FIX_M_2_562915447 .word FIX_0xFFFF +endconst |