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i965/vs: Add a function for how many MRFs get written as part of a SEND.

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This will be used for compute-to-mrf, which needs to know when MRFs
get overwritten.
This commit is contained in:
Eric Anholt 2011-09-06 12:26:42 -07:00
parent 63bc443f8a
commit 160848d8ef
2 changed files with 39 additions and 0 deletions
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37
src/mesa/drivers/dri/i965/brw_vec4.cpp
View file

@ -43,6 +43,43 @@ vec4_instruction::is_math()
opcode == SHADER_OPCODE_COS ||
opcode == SHADER_OPCODE_POW);
}
/**
* Returns how many MRFs an opcode will write over.
*
* Note that this is not the 0 or 1 implied writes in an actual gen
* instruction -- the generate_* functions generate additional MOVs
* for setup.
*/
int
vec4_visitor::implied_mrf_writes(vec4_instruction *inst)
{
if (inst->mlen == 0)
return 0;
switch (inst->opcode) {
case SHADER_OPCODE_RCP:
case SHADER_OPCODE_RSQ:
case SHADER_OPCODE_SQRT:
case SHADER_OPCODE_EXP2:
case SHADER_OPCODE_LOG2:
case SHADER_OPCODE_SIN:
case SHADER_OPCODE_COS:
return 1;
case SHADER_OPCODE_POW:
return 2;
case VS_OPCODE_URB_WRITE:
return 1;
case VS_OPCODE_PULL_CONSTANT_LOAD:
return 2;
case VS_OPCODE_SCRATCH_READ:
return 2;
case VS_OPCODE_SCRATCH_WRITE:
return 3;
default:
assert(!"not reached");
return inst->mlen;
}
}
bool
src_reg::equals(src_reg *r)

2
src/mesa/drivers/dri/i965/brw_vec4.h
View file

@ -441,6 +441,8 @@ public:
vec4_instruction *SCRATCH_READ(dst_reg dst, src_reg index);
vec4_instruction *SCRATCH_WRITE(dst_reg dst, src_reg src, src_reg index);
int implied_mrf_writes(vec4_instruction *inst);
bool try_rewrite_rhs_to_dst(ir_assignment *ir,
dst_reg dst,
src_reg src,