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intel/fs: add 64 bit integer multiplication lowering

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While NIR's lower_imul64() solves the case of 64 bit integer multiplications
generated early, we don't have a way to lower such instructions when they are
generated by our own backend, such as the scan/reduce intrinsics. We'll need
this soon, so implement it now.

An easy way to test this is to simply disable nir_lower_imul64 to let
those operations reach the backend.

v2:
  - Fix Q/UQ copy/paste errors (Caio).
  - Transform an 'if' into 'else if' (Caio).
  - Add an extra comment to clarify the need for 64b = 32b * 32b
    (Caio).
  - Make private functions private (Caio).
v3:
  - Remove ambiguity with 'b' and 'd' variables (Caio).
  - Allocate potentially less regs for the dwords (Caio).

Cc: Jason Ekstrand <jason.ekstrand@intel.com>
Cc: Matt Turner <matt.turner@intel.com>
Cc: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
This commit is contained in:
Paulo Zanoni
2019-07-11 15:08:03 -07:00
committed by Caio Marcelo de Oliveira Filho
parent 9217cf3b5e
commit 866bb775de
2 changed files with 70 additions and 4 deletions
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1
src/intel/compiler/brw_fs.h
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@@ -407,6 +407,7 @@ private:
void resolve_inot_sources(const brw::fs_builder &bld, nir_alu_instr *instr,
fs_reg *op);
void lower_mul_dword_inst(fs_inst *inst, bblock_t *block);
void lower_mul_qword_inst(fs_inst *inst, bblock_t *block);
void lower_mulh_inst(fs_inst *inst, bblock_t *block);
};