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APE: Further ARMv6 filter optimisations: Save 4 'ror's per round by utilising the shift feature of the 'pack halfword' instructions in the unaligned vector addition/ subtraction, better pipelining in the aligned scalarproduct(), and a new method to calculate the unaligned scalarproduct().

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18736 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-10-07 19:40:17 +00:00
parent 46573019a5
commit 6b84f60046
1 changed files with 66 additions and 81 deletions
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147
apps/codecs/demac/libdemac/vector_math16_armv6.h
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@ -39,36 +39,33 @@ static inline void vector_add(int16_t* v1, int16_t* v2)
"10: \n"
"ldrh r4, [%[v2]], #2 \n"
"mov r4, r4, lsl #16 \n"
"1: \n"
"ldmia %[v2]!, {r5-r8} \n"
"ldmia %[v1], {r0-r3} \n"
"mov r5, r5, ror #16 \n"
"pkhbt r4, r4, r5 \n"
"pkhtb r4, r5, r4, asr #16 \n"
"sadd16 r0, r0, r4 \n"
"mov r6, r6, ror #16 \n"
"pkhbt r5, r5, r6 \n"
"pkhbt r5, r5, r6, lsl #16 \n"
"sadd16 r1, r1, r5 \n"
"mov r7, r7, ror #16 \n"
"pkhbt r6, r6, r7 \n"
"pkhtb r6, r7, r6, asr #16 \n"
"sadd16 r2, r2, r6 \n"
"mov r8, r8, ror #16 \n"
"pkhbt r7, r7, r8 \n"
"pkhbt r7, r7, r8, lsl #16 \n"
"sadd16 r3, r3, r7 \n"
"stmia %[v1]!, {r0-r3} \n"
"mov r4, r8 \n"
"ldmia %[v2]!, {r5-r8} \n"
"ldmia %[v1], {r0-r3} \n"
"mov r5, r5, ror #16 \n"
"pkhbt r4, r4, r5 \n"
"pkhtb r4, r5, r4, asr #16 \n"
"sadd16 r0, r0, r4 \n"
"mov r6, r6, ror #16 \n"
"pkhbt r5, r5, r6 \n"
"pkhbt r5, r5, r6, lsl #16 \n"
"sadd16 r1, r1, r5 \n"
"mov r7, r7, ror #16 \n"
"pkhbt r6, r6, r7 \n"
"pkhtb r6, r7, r6, asr #16 \n"
"sadd16 r2, r2, r6 \n"
"mov r8, r8, ror #16 \n"
"pkhbt r7, r7, r8 \n"
"pkhbt r7, r7, r8, lsl #16 \n"
"sadd16 r3, r3, r7 \n"
"stmia %[v1]!, {r0-r3} \n"
#if ORDER > 16
@ -128,36 +125,33 @@ static inline void vector_sub(int16_t* v1, int16_t* v2)
"10: \n"
"ldrh r4, [%[v2]], #2 \n"
"mov r4, r4, lsl #16 \n"
"1: \n"
"ldmia %[v2]!, {r5-r8} \n"
"ldmia %[v1], {r0-r3} \n"
"mov r5, r5, ror #16 \n"
"pkhbt r4, r4, r5 \n"
"pkhtb r4, r5, r4, asr #16 \n"
"ssub16 r0, r0, r4 \n"
"mov r6, r6, ror #16 \n"
"pkhbt r5, r5, r6 \n"
"pkhbt r5, r5, r6, lsl #16 \n"
"ssub16 r1, r1, r5 \n"
"mov r7, r7, ror #16 \n"
"pkhbt r6, r6, r7 \n"
"pkhtb r6, r7, r6, asr #16 \n"
"ssub16 r2, r2, r6 \n"
"mov r8, r8, ror #16 \n"
"pkhbt r7, r7, r8 \n"
"pkhbt r7, r7, r8, lsl #16 \n"
"ssub16 r3, r3, r7 \n"
"stmia %[v1]!, {r0-r3} \n"
"mov r4, r8 \n"
"ldmia %[v2]!, {r5-r8} \n"
"ldmia %[v1], {r0-r3} \n"
"mov r5, r5, ror #16 \n"
"pkhbt r4, r4, r5 \n"
"pkhtb r4, r5, r4, asr #16 \n"
"ssub16 r0, r0, r4 \n"
"mov r6, r6, ror #16 \n"
"pkhbt r5, r5, r6 \n"
"pkhbt r5, r5, r6, lsl #16 \n"
"ssub16 r1, r1, r5 \n"
"mov r7, r7, ror #16 \n"
"pkhbt r6, r6, r7 \n"
"pkhtb r6, r7, r6, asr #16 \n"
"ssub16 r2, r2, r6 \n"
"mov r8, r8, ror #16 \n"
"pkhbt r7, r7, r8 \n"
"pkhbt r7, r7, r8, lsl #16 \n"
"ssub16 r3, r3, r7 \n"
"stmia %[v1]!, {r0-r3} \n"
#if ORDER > 16
@ -217,80 +211,71 @@ static inline int32_t scalarproduct(int16_t* v1, int16_t* v2)
"beq 20f \n"
"10: \n"
"ldrh r2, [%[v2]], #2 \n"
"ldr r0, [%[v1]], #4 \n"
"ldr r3, [%[v2]], #4 \n"
"mov r2, r2, lsl #16 \n"
"ldrh r7, [%[v2]], #2 \n"
"ldmia %[v2]!, {r4-r5} \n"
"ldmia %[v1]!, {r0-r1} \n"
"mov r7, r7, lsl #16 \n"
"1: \n"
"ldr r1, [%[v1]], #4 \n"
"smlabt %[res], r0, r2, %[res] \n"
"ldr r4, [%[v2]], #4 \n"
"smlatb %[res], r0, r3, %[res] \n"
"ldr r0, [%[v1]], #4 \n"
"smlabt %[res], r1, r3, %[res] \n"
"ldr r5, [%[v2]], #4 \n"
"smlatb %[res], r1, r4, %[res] \n"
"ldr r1, [%[v1]], #4 \n"
"smlabt %[res], r0, r4, %[res] \n"
"ldr r6, [%[v2]], #4 \n"
"smlatb %[res], r0, r5, %[res] \n"
"ldr r0, [%[v1]], #4 \n"
"smlabt %[res], r1, r5, %[res] \n"
"ldr r3, [%[v2]], #4 \n"
"smlatb %[res], r1, r6, %[res] \n"
"mov r2, r6 \n"
"ldr r1, [%[v1]], #4 \n"
"smlabt %[res], r0, r2, %[res] \n"
"ldr r4, [%[v2]], #4 \n"
"smlatb %[res], r0, r3, %[res] \n"
"ldr r0, [%[v1]], #4 \n"
"smlabt %[res], r1, r3, %[res] \n"
"ldr r5, [%[v2]], #4 \n"
"smlatb %[res], r1, r4, %[res] \n"
"ldr r1, [%[v1]], #4 \n"
"smlabt %[res], r0, r4, %[res] \n"
"ldr r6, [%[v2]], #4 \n"
"smlatb %[res], r0, r5, %[res] \n"
"pkhbt r8, r4, r7 \n"
"ldmia %[v2]!, {r6-r7} \n"
"smladx %[res], r0, r8, %[res] \n"
"pkhbt r8, r5, r4 \n"
"ldmia %[v1]!, {r2-r3} \n"
"smladx %[res], r1, r8, %[res] \n"
"pkhbt r8, r6, r5 \n"
"ldmia %[v2]!, {r4-r5} \n"
"smladx %[res], r2, r8, %[res] \n"
"pkhbt r8, r7, r6 \n"
"ldmia %[v1]!, {r0-r1} \n"
"smladx %[res], r3, r8, %[res] \n"
"pkhbt r8, r4, r7 \n"
"ldmia %[v2]!, {r6-r7} \n"
"smladx %[res], r0, r8, %[res] \n"
"pkhbt r8, r5, r4 \n"
"ldmia %[v1]!, {r2-r3} \n"
"smladx %[res], r1, r8, %[res] \n"
"pkhbt r8, r6, r5 \n"
#if ORDER > 16
"subs %[cnt], %[cnt], #1 \n"
"ldrne r0, [%[v1]], #4 \n"
"smlabt %[res], r1, r5, %[res] \n"
"ldrne r3, [%[v2]], #4 \n"
"smlatb %[res], r1, r6, %[res] \n"
"mov r2, r6 \n"
"ldmneia %[v2]!, {r4-r5} \n"
"smladx %[res], r2, r8, %[res] \n"
"pkhbt r8, r7, r6 \n"
"ldmneia %[v1]!, {r0-r1} \n"
"smladx %[res], r3, r8, %[res] \n"
"bne 1b \n"
#else
"smlabt %[res], r1, r5, %[res] \n"
"smlatb %[res], r1, r6, %[res] \n"
"pkhbt r7, r7, r6 \n"
"smladx %[res], r2, r8, %[res] \n"
"smladx %[res], r3, r7, %[res] \n"
#endif
"b 99f \n"
"20: \n"
"ldmia %[v1]!, {r0-r1} \n"
"ldmia %[v2]!, {r4-r5} \n"
"ldmia %[v2]!, {r5-r7} \n"
"1: \n"
"ldmia %[v1]!, {r2-r3} \n"
"smlad %[res], r0, r4, %[res] \n"
"ldmia %[v2]!, {r6-r7} \n"
"smlad %[res], r1, r5, %[res] \n"
"ldmia %[v1]!, {r0-r1} \n"
"smlad %[res], r2, r6, %[res] \n"
"smlad %[res], r0, r5, %[res] \n"
"ldmia %[v2]!, {r4-r5} \n"
"smlad %[res], r3, r7, %[res] \n"
"ldmia %[v1]!, {r2-r3} \n"
"smlad %[res], r0, r4, %[res] \n"
"smlad %[res], r1, r6, %[res] \n"
"ldmia %[v1]!, {r0-r1} \n"
"smlad %[res], r2, r7, %[res] \n"
"ldmia %[v2]!, {r6-r7} \n"
"smlad %[res], r1, r5, %[res] \n"
"smlad %[res], r3, r4, %[res] \n"
"ldmia %[v1]!, {r2-r3} \n"
"smlad %[res], r0, r5, %[res] \n"
"ldmia %[v2]!, {r4-r5} \n"
"smlad %[res], r1, r6, %[res] \n"
#if ORDER > 16
"subs %[cnt], %[cnt], #1 \n"
"ldmneia %[v1]!, {r0-r1} \n"
"smlad %[res], r2, r6, %[res] \n"
"ldmneia %[v2]!, {r4-r5} \n"
"smlad %[res], r3, r7, %[res] \n"
"smlad %[res], r2, r7, %[res] \n"
"ldmneia %[v2]!, {r6-r7} \n"
"smlad %[res], r3, r4, %[res] \n"
"bne 1b \n"
#else
"smlad %[res], r2, r6, %[res] \n"
"smlad %[res], r3, r7, %[res] \n"
"smlad %[res], r2, r7, %[res] \n"
"smlad %[res], r3, r4, %[res] \n"
#endif
"99: \n"
@ -303,8 +288,8 @@ static inline int32_t scalarproduct(int16_t* v1, int16_t* v2)
[res]"+r"(res)
: /* inputs */
: /* clobbers */
"r0", "r1", "r2", "r3",
"r4", "r5", "r6", "r7"
"r0", "r1", "r2", "r3", "r4",
"r5", "r6", "r7", "r8"
);
return res;
}