[Mesa-dev] [PATCH 4/5] nir: add a helper for finding duplicate instructions

[Jason Ekstrand]

On Mon, Jun 1, 2015 at 3:29 AM, Pohjolainen, Topi
<topi.pohjolainen at intel.com> wrote:
> On Fri, May 22, 2015 at 02:24:51PM -0400, Connor Abbott wrote:
>> This can be used for both CSE and value numbering.
>>
>> Signed-off-by: Connor Abbott <cwabbott0 at gmail.com>
>> ---
>>  src/glsl/Makefile.sources     |   2 +
>>  src/glsl/nir/nir_instr_hash.c | 255 ++++++++++++++++++++++++++++++++++++++++++
>>  src/glsl/nir/nir_instr_hash.h |  36 ++++++
>>  3 files changed, 293 insertions(+)
>>  create mode 100644 src/glsl/nir/nir_instr_hash.c
>>  create mode 100644 src/glsl/nir/nir_instr_hash.h
>>
>> diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources
>> index 75e5377..fd10cdd 100644
>> --- a/src/glsl/Makefile.sources
>> +++ b/src/glsl/Makefile.sources
>> @@ -28,6 +28,8 @@ NIR_FILES = \
>>       nir/nir_dominance.c \
>>       nir/nir_from_ssa.c \
>>       nir/nir_instr_compare.c \
>> +     nir/nir_instr_hash.c \
>> +     nir/nir_instr_hash.h \
>>       nir/nir_intrinsics.c \
>>       nir/nir_intrinsics.h \
>>       nir/nir_live_variables.c \
>> diff --git a/src/glsl/nir/nir_instr_hash.c b/src/glsl/nir/nir_instr_hash.c
>> new file mode 100644
>> index 0000000..d900b66
>> --- /dev/null
>> +++ b/src/glsl/nir/nir_instr_hash.c
>> @@ -0,0 +1,255 @@
>> +#include "nir_instr_hash.h"
>> +
>> +#define HASH(data) hash = _mesa_fnv32_1a_accumulate(hash, (data))
>
> I don't know how other people feel, but I would be more comfortable with
> having the destination as explicit argument as well:
>
> #define HASH(hash, data) (hash) = _mesa_fnv32_1a_accumulate(hash, data)

I would be marginally inclined to agree, but I don't know how much I
actually care.