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freedreno/ir3: fix for load_front_face intrinsic

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Seems like trying to widen in the same instruction as the add.s does a
non-sign-extending widen.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
This commit is contained in:
Rob Clark
2016-03-21 19:55:37 -04:00
parent 3ca034cada
commit b4c72b792c
1 changed files with 8 additions and 1 deletions
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9
src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
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@@ -1258,7 +1258,14 @@ emit_intrinsic(struct ir3_compile *ctx, nir_intrinsic_instr *intr)
ctx->frag_face = create_input(b, 0);
ctx->frag_face->regs[0]->flags |= IR3_REG_HALF;
}
dst[0] = ir3_ADD_S(b, ctx->frag_face, 0, create_immed(b, 1), 0);
/* for fragface, we always get -1 or 0, but that is inverse
* of what nir expects (where ~0 is true). Unfortunately
* trying to widen from half to full in add.s seems to do a
* non-sign-extending widen (resulting in something that
* gets interpreted as float Inf??)
*/
dst[0] = ir3_COV(b, ctx->frag_face, TYPE_S16, TYPE_S32);
dst[0] = ir3_ADD_S(b, dst[0], 0, create_immed(b, 1), 0);
break;
case nir_intrinsic_discard_if:
case nir_intrinsic_discard: {