From: Rob Clark Date: Fri, 15 Jan 2016 22:07:02 +0000 (-0500) Subject: freedreno/ir3: workaround bug/feature X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ddede497b831fb98e3540247b570968532cdacc9;p=mesa.git freedreno/ir3: workaround bug/feature Seems like in certain cases, we cannot use c 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 --- diff --git a/src/gallium/drivers/freedreno/ir3/ir3_cp.c b/src/gallium/drivers/freedreno/ir3/ir3_cp.c index 0d88e7bc3ab..1cc211a7663 100644 --- a/src/gallium/drivers/freedreno/ir3/ir3_cp.c +++ b/src/gallium/drivers/freedreno/ir3/ir3_cp.c @@ -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;