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3 Commits

Author SHA1 Message Date
Tom Stellard 50122a5890 R600: Match 24-bit arithmetic patterns in a Target DAGCombine 
Moving these patterns from TableGen files to PerformDAGCombine()
should allow us to generate better code by eliminating unnecessary
shifts and extensions earlier.

This also fixes a bug where the MAD pattern was calling
SimplifyDemandedBits with a 24-bit mask on the first operand
even when the full pattern wasn't being matched.  This occasionally
resulted in some instructions being incorrectly deleted from the
program.

v2:
  - Fix bug with 64-bit mul

llvm-svn: 205731
 2014-04-07 19:45:41 +00:00
Tom Stellard 70f13dba15 R600/SI: Use -verify-machineinstrs for most tests 
We can't enable the verifier for tests with SI_IF and SI_ELSE, because
these instructions are always followed by a COPY which copies their
result to the next basic block.  This violates the machine verifier's
rule that non-terminators can not folow terminators.

Reviewed-by: Vincent Lejeune<vljn at ovi.com>
llvm-svn: 192366
 2013-10-10 17:11:46 +00:00
Tom Stellard 41fc7853be R600: Add support for 24-bit MUL instructions 
Reviewed-by: Vincent Lejeune <vljn at ovi.com>
llvm-svn: 186922
 2013-07-23 01:48:42 +00:00