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vc4: Optimize SF(ITOF(x)) -> SF(x).

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This is a common production of st_glsl_to_tgsi, because CMP takes a float
argument.
This commit is contained in:
Eric Anholt 2014-10-09 09:36:03 +02:00
parent 00a9aebfe0
commit 5a13522898
1 changed files with 16 additions and 0 deletions
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16
src/gallium/drivers/vc4/vc4_opt_algebraic.c
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@ -91,6 +91,22 @@ qir_opt_algebraic(struct vc4_compile *c)
defs[inst->dst.index] = inst;
switch (inst->op) {
case QOP_SF:
/* SF just looks at the sign bit, or whether all the
* bits are 0. This is preserved across an itof
* transformation.
*/
if (inst->src[0].file == QFILE_TEMP &&
defs[inst->src[0].index]->op == QOP_ITOF) {
dump_from(c, inst);
inst->src[0] =
defs[inst->src[0].index]->src[0];
progress = true;
dump_to(c, inst);
break;
}
break;
case QOP_SEL_X_Y_ZS:
case QOP_SEL_X_Y_ZC:
case QOP_SEL_X_Y_NS: