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i965/peephole_ffma: Only match a mul+add if none of the ops are exact

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Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Jason Ekstrand 2016-03-28 11:47:27 -07:00
parent eb93d6dec8
commit 88ef2476dc
1 changed files with 11 additions and 0 deletions
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11
src/mesa/drivers/dri/i965/brw_nir_opt_peephole_ffma.c
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@ -84,6 +84,17 @@ get_mul_for_src(nir_alu_src *src, int num_components,
return NULL;
nir_alu_instr *alu = nir_instr_as_alu(instr);
/* We want to bail if any of the other ALU operations involved is labled
* exact. One reason for this is that, while the value that is changing is
* actually the result of the add and not the multiply, the intention of
* the user when they specify an exact multiply is that they want *that*
* value and what they don't care about is the add. Another reason is that
* SPIR-V explicitly requires this behaviour.
*/
if (alu->exact)
return NULL;
switch (alu->op) {
case nir_op_imov:
case nir_op_fmov: