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x86: yadif: fix asm with suncc 

Under some circumstances, suncc will use a single register for the
address of all memory operands, inserting lea instructions loading
the correct address prior to each memory operand being used in the
code. In the yadif code, the branch in the asm block bypasses such
an lea instruction, causing an incorrect address to be used in the
following load.

This patch replaces the tmpX arrays with a single array and uses a
register operand to hold its address. Although this prevents using
offsets from the stack pointer to access these locations, the code
still builds as 32-bit PIC even with old compilers.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-08-12 19:45:46 +01:00
parent 8ec0204ee4
commit 480178a295
1 changed files with 13 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
libavfilter/x86/yadif_template.c
View File

@ -107,10 +107,7 @@ static void RENAME(yadif_filter_line)(uint8_t *dst, uint8_t *prev, uint8_t *cur,
uint8_t *next, int w, int prefs,
int mrefs, int parity, int mode)
{
DECLARE_ALIGNED(16, uint8_t, tmp0)[16];
DECLARE_ALIGNED(16, uint8_t, tmp1)[16];
DECLARE_ALIGNED(16, uint8_t, tmp2)[16];
DECLARE_ALIGNED(16, uint8_t, tmp3)[16];
DECLARE_ALIGNED(16, uint8_t, tmp)[16*4];
int x;
#define FILTER\
@ -124,9 +121,9 @@ static void RENAME(yadif_filter_line)(uint8_t *dst, uint8_t *prev, uint8_t *cur,
MOVQ" "MM"3, "MM"4 \n\t"\
"paddw "MM"2, "MM"3 \n\t"\
"psraw $1, "MM"3 \n\t" /* d = (prev2[x] + next2[x])>>1 */\
MOVQ" "MM"0, %[tmp0] \n\t" /* c */\
MOVQ" "MM"3, %[tmp1] \n\t" /* d */\
MOVQ" "MM"1, %[tmp2] \n\t" /* e */\
MOVQ" "MM"0, (%[tmp]) \n\t" /* c */\
MOVQ" "MM"3, 16(%[tmp]) \n\t" /* d */\
MOVQ" "MM"1, 32(%[tmp]) \n\t" /* e */\
"psubw "MM"4, "MM"2 \n\t"\
PABS( MM"4", MM"2") /* temporal_diff0 */\
LOAD("(%[prev],%[mrefs])", MM"3") /* prev[x-refs] */\
@ -148,7 +145,7 @@ static void RENAME(yadif_filter_line)(uint8_t *dst, uint8_t *prev, uint8_t *cur,
"paddw "MM"4, "MM"3 \n\t" /* temporal_diff2 */\
"psrlw $1, "MM"3 \n\t"\
"pmaxsw "MM"3, "MM"2 \n\t"\
MOVQ" "MM"2, %[tmp3] \n\t" /* diff */\
MOVQ" "MM"2, 48(%[tmp]) \n\t" /* diff */\
\
"paddw "MM"0, "MM"1 \n\t"\
"paddw "MM"0, "MM"0 \n\t"\
@ -179,7 +176,7 @@ static void RENAME(yadif_filter_line)(uint8_t *dst, uint8_t *prev, uint8_t *cur,
CHECK2\
\
/* if(p->mode<2) ... */\
MOVQ" %[tmp3], "MM"6 \n\t" /* diff */\
MOVQ" 48(%[tmp]), "MM"6 \n\t" /* diff */\
"cmpl $2, %[mode] \n\t"\
"jge 1f \n\t"\
LOAD("(%["prev2"],%[mrefs],2)", MM"2") /* prev2[x-2*refs] */\
@ -190,9 +187,9 @@ static void RENAME(yadif_filter_line)(uint8_t *dst, uint8_t *prev, uint8_t *cur,
"paddw "MM"5, "MM"3 \n\t"\
"psrlw $1, "MM"2 \n\t" /* b */\
"psrlw $1, "MM"3 \n\t" /* f */\
MOVQ" %[tmp0], "MM"4 \n\t" /* c */\
MOVQ" %[tmp1], "MM"5 \n\t" /* d */\
MOVQ" %[tmp2], "MM"7 \n\t" /* e */\
MOVQ" (%[tmp]), "MM"4 \n\t" /* c */\
MOVQ" 16(%[tmp]), "MM"5 \n\t" /* d */\
MOVQ" 32(%[tmp]), "MM"7 \n\t" /* e */\
"psubw "MM"4, "MM"2 \n\t" /* b-c */\
"psubw "MM"7, "MM"3 \n\t" /* f-e */\
MOVQ" "MM"5, "MM"0 \n\t"\
@ -211,7 +208,7 @@ static void RENAME(yadif_filter_line)(uint8_t *dst, uint8_t *prev, uint8_t *cur,
"pmaxsw "MM"4, "MM"6 \n\t" /* diff= MAX3(diff, min, -max); */\
"1: \n\t"\
\
MOVQ" %[tmp1], "MM"2 \n\t" /* d */\
MOVQ" 16(%[tmp]), "MM"2 \n\t" /* d */\
MOVQ" "MM"2, "MM"3 \n\t"\
"psubw "MM"6, "MM"2 \n\t" /* d-diff */\
"paddw "MM"6, "MM"3 \n\t" /* d+diff */\
@ -219,16 +216,13 @@ static void RENAME(yadif_filter_line)(uint8_t *dst, uint8_t *prev, uint8_t *cur,
"pminsw "MM"3, "MM"1 \n\t" /* d = clip(spatial_pred, d-diff, d+diff); */\
"packuswb "MM"1, "MM"1 \n\t"\
\
:[tmp0]"=m"(tmp0),\
[tmp1]"=m"(tmp1),\
[tmp2]"=m"(tmp2),\
[tmp3]"=m"(tmp3)\
:[prev] "r"(prev),\
::[prev] "r"(prev),\
[cur] "r"(cur),\
[next] "r"(next),\
[prefs]"r"((x86_reg)prefs),\
[mrefs]"r"((x86_reg)mrefs),\
[mode] "g"(mode)\
[mode] "g"(mode),\
[tmp] "r"(tmp)\
);\
__asm__ volatile(MOV" "MM"1, %0" :"=m"(*dst));\
dst += STEP;\