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i965/vs: Allow copy propagation on GRFs.

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Further reduces instruction count by 4.0% in 40.7% of the vertex
shaders.
This commit is contained in:
Eric Anholt
2011-09-01 16:43:38 -07:00
parent 6d0c018776
commit 29361e14df
1 changed files with 6 additions and 1 deletions
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src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
+6 -1
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@@ -187,6 +187,7 @@ try_copy_propagation(struct intel_context *intel,
value.swizzle = BRW_SWIZZLE4(s[0], s[1], s[2], s[3]);
if (value.file != UNIFORM &&
value.file != GRF &&
value.file != ATTR)
return false;
@@ -204,6 +205,10 @@ try_copy_propagation(struct intel_context *intel,
if (intel->gen >= 6 && inst->is_math())
return false;
/* Don't report progress if this is a noop. */
if (value.equals(&inst->src[arg]))
return false;
inst->src[arg] = value;
return true;
}
@@ -307,7 +312,7 @@ vec4_visitor::opt_copy_propagation()
cur_value[i][j] &&
cur_value[i][j]->file == GRF &&
cur_value[i][j]->reg == inst->dst.reg &&
cur_value[i][j]->reg == inst->dst.reg) {
cur_value[i][j]->reg_offset == inst->dst.reg_offset) {
cur_value[i][j] = NULL;
}
}