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intel/fs: Add a SCRATCH_HEADER opcode

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This opcode is responsible for setting up the buffer base address and
per-thread scratch space fields of a scratch message header.  For the
most part, it's a copy of g0 but some messages need us to zero out g0.2
and the bottom bits of g0.5.

This may actually fix a bug when nir_load/store_scratch is used.  The
docs say that the DWORD scattered messages respect the per-thread
scratch size specified in gN.3[3:0] in the message header but we've been
leaving it zero.  This may mean that we've been ignoring any scratch
reads/writes from a load/store_scratch intrinsic above the 1KB mark.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7084>
This commit is contained in:
Jason Ekstrand
2020-10-09 04:13:20 -05:00
committed by Marge Bot
parent 24b64c8408
commit 06ebf23283
6 changed files with 86 additions and 33 deletions
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1
src/intel/compiler/brw_fs.h
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@@ -513,6 +513,7 @@ private:
void generate_scratch_write(fs_inst *inst, struct brw_reg src);
void generate_scratch_read(fs_inst *inst, struct brw_reg dst);
void generate_scratch_read_gen7(fs_inst *inst, struct brw_reg dst);
void generate_scratch_header(fs_inst *inst, struct brw_reg dst);
void generate_uniform_pull_constant_load(fs_inst *inst, struct brw_reg dst,
struct brw_reg index,
struct brw_reg offset);