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i965/fs: Use mov(4) instructions to read timestamp.

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We only want fields 0-2.
This commit is contained in:
Matt Turner 2014-10-31 11:12:30 -07:00
parent cd93d82ba9
commit ee7e6009a9
1 changed files with 4 additions and 5 deletions
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9
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -679,19 +679,18 @@ fs_visitor::get_timestamp()
{
assert(brw->gen >= 7);
fs_reg ts = fs_reg(retype(brw_vec1_reg(BRW_ARCHITECTURE_REGISTER_FILE,
fs_reg ts = fs_reg(retype(brw_vec4_reg(BRW_ARCHITECTURE_REGISTER_FILE,
BRW_ARF_TIMESTAMP,
0),
BRW_REGISTER_TYPE_UD));
fs_reg dst = fs_reg(this, glsl_type::uint_type);
fs_reg dst = fs_reg(GRF, virtual_grf_alloc(1), BRW_REGISTER_TYPE_UD, 4);
fs_inst *mov = emit(MOV(dst, ts));
/* We want to read the 3 fields we care about (mostly field 0, but also 2)
* even if it's not enabled in the dispatch.
/* We want to read the 3 fields we care about even if it's not enabled in
* the dispatch.
*/
mov->force_writemask_all = true;
mov->exec_size = 8;
/* The caller wants the low 32 bits of the timestamp. Since it's running
* at the GPU clock rate of ~1.2ghz, it will roll over every ~3 seconds,