[Mesa-dev] [PATCH v2 6/6] i965: Add a debug option for spilling everything in vec4 code

[Francisco Jerez]

Iago Toral <itoral at igalia.com> writes:

> On Thu, 2015-07-30 at 16:13 +0300, Francisco Jerez wrote:
>> Iago Toral <itoral at igalia.com> writes:
>> 
>> > On Thu, 2015-07-30 at 15:58 +0300, Francisco Jerez wrote:
>> >> Iago Toral Quiroga <itoral at igalia.com> writes:
>> >> 
>> >> > ---
>> >> >  src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp | 2 +-
>> >> >  src/mesa/drivers/dri/i965/brw_vec4.cpp            | 2 +-
>> >> >  src/mesa/drivers/dri/i965/intel_debug.c           | 3 ++-
>> >> >  src/mesa/drivers/dri/i965/intel_debug.h           | 5 +++--
>> >> >  4 files changed, 7 insertions(+), 5 deletions(-)
>> >> >
>> >> > diff --git a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
>> >> > index f25f2ec..714248a 100644
>> >> > --- a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
>> >> > +++ b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
>> >> > @@ -634,7 +634,7 @@ fs_visitor::assign_regs(bool allow_spilling)
>> >> >     }
>> >> >  
>> >> >     /* Debug of register spilling: Go spill everything. */
>> >> > -   if (unlikely(INTEL_DEBUG & DEBUG_SPILL)) {
>> >> > +   if (unlikely(INTEL_DEBUG & DEBUG_SPILL_FS)) {
>> >> >        int reg = choose_spill_reg(g);
>> >> >  
>> >> >        if (reg != -1) {
>> >> > diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
>> >> > index 53270fb..6cf5ede 100644
>> >> > --- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
>> >> > +++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
>> >> > @@ -1814,7 +1814,7 @@ vec4_visitor::run(gl_clip_plane *clip_planes)
>> >> >  
>> >> >     setup_payload();
>> >> >  
>> >> > -   if (false) {
>> >> > +   if (unlikely(INTEL_DEBUG & DEBUG_SPILL_VEC4)) {
>> >> >        /* Debug of register spilling: Go spill everything. */
>> >> >        const int grf_count = alloc.count;
>> >> >        float spill_costs[alloc.count];
>> >> > diff --git a/src/mesa/drivers/dri/i965/intel_debug.c b/src/mesa/drivers/dri/i965/intel_debug.c
>> >> > index a077731..8d34349 100644
>> >> > --- a/src/mesa/drivers/dri/i965/intel_debug.c
>> >> > +++ b/src/mesa/drivers/dri/i965/intel_debug.c
>> >> > @@ -69,7 +69,8 @@ static const struct dri_debug_control debug_control[] = {
>> >> >     { "ann",         DEBUG_ANNOTATION },
>> >> >     { "no8",         DEBUG_NO8 },
>> >> >     { "vec4vs",      DEBUG_VEC4VS },
>> >> > -   { "spill",       DEBUG_SPILL },
>> >> > +   { "spill_frag",  DEBUG_SPILL_FS },
>> >> 
>> >> How about we call this "spill_fs" instead?  The flag doesn't only affect
>> >> fragment shaders, AFAICT it will cause all programs compiled with the FS
>> >> back-end [F for fast ;)] to spill everything.  With that fixed:
>> >
>> > that was my first choice, but if we do that it seems that
>> > driParseDebugString will also mark INTEL_DEBUG=fs as enabled.
>> >
>> > It seems as if this function checks if any of the string options is
>> > present in the provided string to enable them, so we can't really use an
>> > option name where any substring of it is included as a separate
>> > option :-(
>> >
>> 
>> Oh man...  That sounds seriously broken...
>
> So with that explanation as to why we can't change that, does your Rb
> stand?
>
Seems like a hack and might be confusing because it will cause shaders
of stages other than fragment to be spilled.  But if you insist in using
a band-aid solution you can have my:

Acked-by: Francisco Jerez <currojerez at riseup.net>

>> >> Reviewed-by: Francisco Jerez <currojerez at riseup.net>
>> >> 
>> >> > +   { "spill_vec4",  DEBUG_SPILL_VEC4 },
>> >> >     { "cs",          DEBUG_CS },
>> >> >     { NULL,    0 }
>> >> >  };
>> >> > diff --git a/src/mesa/drivers/dri/i965/intel_debug.h b/src/mesa/drivers/dri/i965/intel_debug.h
>> >> > index 4689492..b7d0c82 100644
>> >> > --- a/src/mesa/drivers/dri/i965/intel_debug.h
>> >> > +++ b/src/mesa/drivers/dri/i965/intel_debug.h
>> >> > @@ -64,8 +64,9 @@ extern uint64_t INTEL_DEBUG;
>> >> >  #define DEBUG_ANNOTATION          (1ull << 28)
>> >> >  #define DEBUG_NO8                 (1ull << 29)
>> >> >  #define DEBUG_VEC4VS              (1ull << 30)
>> >> > -#define DEBUG_SPILL               (1ull << 31)
>> >> > -#define DEBUG_CS                  (1ull << 32)
>> >> > +#define DEBUG_SPILL_FS            (1ull << 31)
>> >> > +#define DEBUG_SPILL_VEC4          (1ull << 32)
>> >> > +#define DEBUG_CS                  (1ull << 33)
>> >> >  
>> >> >  #ifdef HAVE_ANDROID_PLATFORM
>> >> >  #define LOG_TAG "INTEL-MESA"
>> >> > -- 
>> >> > 1.9.1
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