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i965/vec4: Add parameter to skip doing constant propagation. 

After CSEing some MOV ..., VF instructions we have code like

   mov tmp, [1F, 2F, 3F, 4F]VF
   mov r10, tmp
   mov r11, tmp
   ...
   use r10
   use r11

We want to copy propagate tmp into the uses of r10 and r11, but *not*
constant propagate the VF immediate into the uses of tmp.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner 2014-12-20 17:37:09 -08:00
parent bbdd3198a5
commit c855f49c99
2 changed files with 3 additions and 3 deletions
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2
src/mesa/drivers/dri/i965/brw_vec4.h
View File

@ -369,7 +369,7 @@ public:
bool opt_reduce_swizzle();
bool dead_code_eliminate();
bool virtual_grf_interferes(int a, int b);
bool opt_copy_propagation();
bool opt_copy_propagation(bool do_constant_prop = true);
bool opt_cse_local(bblock_t *block);
bool opt_cse();
bool opt_algebraic();

4
src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
View File

@ -330,7 +330,7 @@ try_copy_propagate(struct brw_context *brw, vec4_instruction *inst,
}
bool
vec4_visitor::opt_copy_propagation()
vec4_visitor::opt_copy_propagation(bool do_constant_prop)
{
bool progress = false;
struct copy_entry entries[virtual_grf_reg_count];
@ -395,7 +395,7 @@ vec4_visitor::opt_copy_propagation()
if (c != 4)
continue;
if (try_constant_propagate(brw, inst, i, &entry))
if (do_constant_prop && try_constant_propagate(brw, inst, i, &entry))
progress = true;
if (try_copy_propagate(brw, inst, i, &entry, reg))