Mesa (master): i965/emit: Add assertions for accumulator restrictions
Jason Ekstrand
jekstrand at kemper.freedesktop.org
Sat Sep 12 17:52:05 UTC 2015
Module: Mesa
Branch: master
Commit: dd7290cf59206c49f1a322d53baa9957b13d2949
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=dd7290cf59206c49f1a322d53baa9957b13d2949
Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date: Thu Sep 10 16:19:22 2015 -0700
i965/emit: Add assertions for accumulator restrictions
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
---
src/mesa/drivers/dri/i965/brw_eu_emit.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index 637fd07..0432efa 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -235,6 +235,15 @@ validate_reg(const struct brw_device_info *devinfo,
reg.file == BRW_ARF_NULL)
return;
+ /* From the IVB PRM Vol. 4, Pt. 3, Section 3.3.3.5:
+ *
+ * "Swizzling is not allowed when an accumulator is used as an implicit
+ * source or an explicit source in an instruction."
+ */
+ if (reg.file == BRW_ARCHITECTURE_REGISTER_FILE &&
+ reg.nr == BRW_ARF_ACCUMULATOR)
+ assert(reg.dw1.bits.swizzle == BRW_SWIZZLE_XYZW);
+
assert(reg.hstride >= 0 && reg.hstride < ARRAY_SIZE(hstride_for_reg));
hstride = hstride_for_reg[reg.hstride];
@@ -443,6 +452,14 @@ brw_set_src1(struct brw_codegen *p, brw_inst *inst, struct brw_reg reg)
if (reg.file != BRW_ARCHITECTURE_REGISTER_FILE)
assert(reg.nr < 128);
+ /* From the IVB PRM Vol. 4, Pt. 3, Section 3.3.3.5:
+ *
+ * "Accumulator registers may be accessed explicitly as src0
+ * operands only."
+ */
+ assert(reg.file != BRW_ARCHITECTURE_REGISTER_FILE ||
+ reg.nr != BRW_ARF_ACCUMULATOR);
+
gen7_convert_mrf_to_grf(p, ®);
assert(reg.file != BRW_MESSAGE_REGISTER_FILE);
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