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i965: Use the SEL instruction to implement MIN and MAX. 

Saves an instruction over doing conditional moves.
This commit is contained in:
Eric Anholt 2010-03-10 15:32:05 -08:00
parent 13a13fcb80
commit ba541b0769
1 changed files with 3 additions and 11 deletions
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14
src/mesa/drivers/dri/i965/brw_wm_emit.c
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@ -633,14 +633,10 @@ void emit_max(struct brw_compile *p,
for (i = 0; i < 4; i++) {
if (mask & (1<<i)) {
brw_set_saturate(p, (mask & SATURATE) ? 1 : 0);
brw_MOV(p, dst[i], arg0[i]);
brw_set_saturate(p, 0);
brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_L, arg0[i], arg1[i]);
brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_GE, arg0[i], arg1[i]);
brw_set_saturate(p, (mask & SATURATE) ? 1 : 0);
brw_MOV(p, dst[i], arg1[i]);
brw_SEL(p, dst[i], arg0[i], arg1[i]);
brw_set_saturate(p, 0);
brw_set_predicate_control_flag_value(p, 0xff);
}
@ -657,14 +653,10 @@ void emit_min(struct brw_compile *p,
for (i = 0; i < 4; i++) {
if (mask & (1<<i)) {
brw_set_saturate(p, (mask & SATURATE) ? 1 : 0);
brw_MOV(p, dst[i], arg1[i]);
brw_set_saturate(p, 0);
brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_L, arg0[i], arg1[i]);
brw_set_saturate(p, (mask & SATURATE) ? 1 : 0);
brw_MOV(p, dst[i], arg0[i]);
brw_SEL(p, dst[i], arg0[i], arg1[i]);
brw_set_saturate(p, 0);
brw_set_predicate_control_flag_value(p, 0xff);
}