diff options
| author | Eric Anholt <eric@anholt.net> | 2014-09-24 21:57:06 -0700 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2014-09-29 11:33:34 -0700 |
| commit | 76cd9955d96c1b0a13905e255571eb35b3aa2a99 (patch) | |
| tree | f2a21d620b6661ca69cb80d2aa45f4426b3f3113 /src/gallium/drivers/vc4/vc4_opt_algebraic.c | |
| parent | 64122b16ce74a3fb65269bab325c651c26ccd2d0 (diff) | |
vc4: Optimize out silly SUBs of 0.
Drops instructions on vs-temp-array-mat4-index-col-row-wr.shader_test,
which I was looking at because it's failing to register allocate.
Diffstat (limited to 'src/gallium/drivers/vc4/vc4_opt_algebraic.c')
| -rw-r--r-- | src/gallium/drivers/vc4/vc4_opt_algebraic.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/gallium/drivers/vc4/vc4_opt_algebraic.c b/src/gallium/drivers/vc4/vc4_opt_algebraic.c index b5cde0511d0..f88a5c17d2a 100644 --- a/src/gallium/drivers/vc4/vc4_opt_algebraic.c +++ b/src/gallium/drivers/vc4/vc4_opt_algebraic.c @@ -117,6 +117,17 @@ qir_opt_algebraic(struct vc4_compile *c) } break; + case QOP_FSUB: + case QOP_SUB: + if (is_zero(c, defs, inst->src[1])) { + dump_from(c, inst); + inst->op = QOP_MOV; + inst->src[1] = c->undef; + progress = true; + dump_to(c, inst); + } + break; + default: break; } |