devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Avoid unnecessary register copies on ARMv5.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19112 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-11-16 10:12:38 +00:00
parent c41bd04722
commit 5ba11af855
1 changed files with 22 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

46
apps/codecs/demac/libdemac/vector_math16_armv5te.h
View file

@ -127,32 +127,30 @@ static inline int32_t scalarproduct(int16_t* v1, int16_t* v2)
"beq 20f \n"
"10: \n"
"ldrh r4, [%[v2]], #2 \n"
"mov r4, r4, lsl #16 \n"
"ldrh r7, [%[v2]], #2 \n"
"mov r7, r7, lsl #16 \n"
"1: \n"
"ldmia %[v1]!, {r0-r3} \n"
"ldmia %[v2]!, {r5-r8} \n"
"smlabt %[res], r0, r4, %[res] \n"
"smlatb %[res], r0, r5, %[res] \n"
"smlabt %[res], r1, r5, %[res] \n"
"smlatb %[res], r1, r6, %[res] \n"
"smlabt %[res], r2, r6, %[res] \n"
"smlatb %[res], r2, r7, %[res] \n"
"smlabt %[res], r3, r7, %[res] \n"
"smlatb %[res], r3, r8, %[res] \n"
"mov r4, r8 \n"
"smlabt %[res], r0, r7, %[res] \n"
"ldmia %[v2]!, {r4-r7} \n"
"smlatb %[res], r0, r4, %[res] \n"
"smlabt %[res], r1, r4, %[res] \n"
"smlatb %[res], r1, r5, %[res] \n"
"smlabt %[res], r2, r5, %[res] \n"
"smlatb %[res], r2, r6, %[res] \n"
"smlabt %[res], r3, r6, %[res] \n"
"smlatb %[res], r3, r7, %[res] \n"
"ldmia %[v1]!, {r0-r3} \n"
"ldmia %[v2]!, {r5-r8} \n"
"smlabt %[res], r0, r4, %[res] \n"
"smlatb %[res], r0, r5, %[res] \n"
"smlabt %[res], r1, r5, %[res] \n"
"smlatb %[res], r1, r6, %[res] \n"
"smlabt %[res], r2, r6, %[res] \n"
"smlatb %[res], r2, r7, %[res] \n"
"smlabt %[res], r3, r7, %[res] \n"
"smlatb %[res], r3, r8, %[res] \n"
"smlabt %[res], r0, r7, %[res] \n"
"ldmia %[v2]!, {r4-r7} \n"
"smlatb %[res], r0, r4, %[res] \n"
"smlabt %[res], r1, r4, %[res] \n"
"smlatb %[res], r1, r5, %[res] \n"
"smlabt %[res], r2, r5, %[res] \n"
"smlatb %[res], r2, r6, %[res] \n"
"smlabt %[res], r3, r6, %[res] \n"
"smlatb %[res], r3, r7, %[res] \n"
#if ORDER > 16
"mov r4, r8 \n"
"subs %[cnt], %[cnt], #1 \n"
"bne 1b \n"
#endif
@ -195,8 +193,8 @@ static inline int32_t scalarproduct(int16_t* v1, int16_t* v2)
[res]"+r"(res)
: /* inputs */
: /* clobbers */
"r0", "r1", "r2", "r3", "r4",
"r5", "r6", "r7", "r8"
"r0", "r1", "r2", "r3",
"r4", "r5", "r6", "r7"
);
return res;
}