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freedreno/ir3: workaround bug/feature

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Seems like in certain cases, we cannot use c<a0.x+0> as the third src to
cat3 instructions.  This may be slightly conservative, we may only have
this restriction when the first src is also const.

This fixes, for example, +24/-0 of the variable-indexing piglit tests.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
This commit is contained in:
Rob Clark 2016-01-15 17:07:02 -05:00
parent ebd3a1fc17
commit ddede497b8
1 changed files with 9 additions and 0 deletions
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9
src/gallium/drivers/freedreno/ir3/ir3_cp.c
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@ -288,6 +288,15 @@ reg_cp(struct ir3_instruction *instr, struct ir3_register *reg, unsigned n)
conflicts(instr->address, reg->instr->address))
return;
/* This seems to be a hw bug, or something where the timings
* just somehow don't work out. This restriction may only
* apply if the first src is also CONST.
*/
if ((instr->category == 3) && (n == 2) &&
(src_reg->flags & IR3_REG_RELATIV) &&
(src_reg->array.offset == 0))
return;
src_reg = ir3_reg_clone(instr->block->shader, src_reg);
src_reg->flags = new_flags;
instr->regs[n+1] = src_reg;