2 commits

Author	SHA1	Message	Date
Rob Clark	f596135616	nir: fix bit of cargo-culting in lower_idiv ... I guess I was looking too much at how lower_system_values worked when writing lower_idiv. Since ttn wasn't emitting load_var for sysvals and the only drivers using lower_idiv were using ttn, I think nothing was broken as a result. But might as well fix this before it becomes a problem. Signed-off-by: Rob Clark <robclark@freedesktop.org> Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>	2015-04-11 10:43:16 -04:00
Rob Clark	f2ecc95e44	nir: add lowering for idiv/udiv/umod ... Based on the algo from NV50LegalizeSSA::handleDIV() and handleMOD(). See also trans_idiv() in freedreno/ir3/ir3_compiler.c (which was an adaptation of the nv50 code from Ilia Mirkin). A python/numpy script which implements the same algorithm (and is possibly useful for debugging or analysis) can be found here: http://people.freedesktop.org/~robclark/div-lowering.py I've tested this on i965 hacked up to insert the idiv lowering pass, and on freedreno with NIR frontend. Signed-off-by: Rob Clark <robclark@freedesktop.org> Tested-by: Eric Anholt <eric@anholt.net> (vc4)	2015-04-05 09:20:35 -04:00