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tgsi: simplify and fix sse KIL implementation

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Use sse_movmskps to extract the correct bits of the comparison result
for use in updating the killmask.  Simplify some logic around
identifying the set of necessary comparisons to make.
This commit is contained in:
Keith Whitwell 2009-07-16 12:49:27 +01:00
parent e1ad38ad8e
commit caf5d52d48
1 changed files with 28 additions and 36 deletions
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64
src/gallium/auxiliary/tgsi/tgsi_sse2.c
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@ -1558,10 +1558,9 @@ emit_kil(
const struct tgsi_full_src_register *reg )
{
unsigned uniquemask;
unsigned registers[4];
unsigned nextregister = 0;
unsigned firstchan = ~0;
unsigned unique_count = 0;
unsigned chan_index;
unsigned i;
/* This mask stores component bits that were already tested. Note that
* we test if the value is less than zero, so 1.0 and 0.0 need not to be
@ -1581,18 +1580,11 @@ emit_kil(
uniquemask |= 1 << swizzle;
/* allocate register */
registers[chan_index] = nextregister;
emit_fetch(
func,
nextregister,
unique_count++,
reg,
chan_index );
nextregister++;
/* mark the first channel used */
if( firstchan == ~0 ) {
firstchan = chan_index;
}
}
}
@ -1603,32 +1595,32 @@ emit_kil(
func,
x86_make_reg( file_REG32, reg_DX ) );
FOR_EACH_CHANNEL( chan_index ) {
if( uniquemask & (1 << chan_index) ) {
sse_cmpps(
func,
make_xmm( registers[chan_index] ),
get_temp(
TGSI_EXEC_TEMP_00000000_I,
TGSI_EXEC_TEMP_00000000_C ),
cc_LessThan );
for (i = 0 ; i < unique_count; i++ ) {
struct x86_reg dataXMM = make_xmm(i);
if( chan_index == firstchan ) {
sse_pmovmskb(
func,
x86_make_reg( file_REG32, reg_AX ),
make_xmm( registers[chan_index] ) );
}
else {
sse_pmovmskb(
func,
x86_make_reg( file_REG32, reg_DX ),
make_xmm( registers[chan_index] ) );
x86_or(
func,
x86_make_reg( file_REG32, reg_AX ),
x86_make_reg( file_REG32, reg_DX ) );
}
sse_cmpps(
func,
dataXMM,
get_temp(
TGSI_EXEC_TEMP_00000000_I,
TGSI_EXEC_TEMP_00000000_C ),
cc_LessThan );
if( i == 0 ) {
sse_movmskps(
func,
x86_make_reg( file_REG32, reg_AX ),
dataXMM );
}
else {
sse_movmskps(
func,
x86_make_reg( file_REG32, reg_DX ),
dataXMM );
x86_or(
func,
x86_make_reg( file_REG32, reg_AX ),
x86_make_reg( file_REG32, reg_DX ) );
}
}