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mips/fft: remove some useless assembly

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Remove some assembly that the compiler can easily handle optimally on its own.
GCC produces almost identical assembly.

Signed-off-by: James Cowgill <james410@cowgill.org.uk>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
James Cowgill 2015-02-26 13:42:45 +00:00 committed by Michael Niedermayer
parent 390771481a
commit d6f66aec50
1 changed files with 2 additions and 24 deletions
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26
libavcodec/mips/fft_mips.c
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@ -65,26 +65,12 @@ static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z)
float w_re, w_im;
float *w_re_ptr, *w_im_ptr;
const int fft_size = (1 << s->nbits);
int s_n = s->nbits;
int tem1, tem2;
float pom, pom1, pom2, pom3;
float temp, temp1, temp3, temp4;
FFTComplex * tmpz_n2, * tmpz_n34, * tmpz_n4;
FFTComplex * tmpz_n2_i, * tmpz_n34_i, * tmpz_n4_i, * tmpz_i;
/**
*num_transforms = (0x2aab >> (16 - s->nbits)) | 1;
*/
__asm__ volatile (
"li %[tem1], 16 \n\t"
"sub %[s_n], %[tem1], %[s_n] \n\t"
"li %[tem2], 10923 \n\t"
"srav %[tem2], %[tem2], %[s_n] \n\t"
"ori %[num_t],%[tem2], 1 \n\t"
: [num_t]"=r"(num_transforms), [s_n]"+r"(s_n),
[tem1]"=&r"(tem1), [tem2]"=&r"(tem2)
);
num_transforms = (0x2aab >> (16 - s->nbits)) | 1;
for (n=0; n<num_transforms; n++) {
offset = ff_fft_offsets_lut[n] << 2;
@ -214,15 +200,7 @@ static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z)
n4 = 4;
for (nbits=4; nbits<=s->nbits; nbits++) {
/*
* num_transforms = (num_transforms >> 1) | 1;
*/
__asm__ volatile (
"sra %[num_t], %[num_t], 1 \n\t"
"ori %[num_t], %[num_t], 1 \n\t"
: [num_t] "+r" (num_transforms)
);
num_transforms = (num_transforms >> 1) | 1;
n2 = 2 * n4;
n34 = 3 * n4;