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Author SHA1 Message Date
Anton Korobeynikov 3edd854d64 Perform mul combine when multiplying wiht negative constants. 
Patch by Weiming Zhao!
This fixes PR12212

llvm-svn: 153049
 2012-03-19 19:19:50 +00:00
Jim Grosbach 6d800f88da Update tests to handle MC-inst instruction printing of shift operations. The 
legacy asm printer uses instructions of the form, "mov r0, r0, lsl #3", while
the MC-instruction printer uses the form "lsl r0, r0, #3". The latter mnemonic
is correct and preferred according the ARM documentation (A8.6.98). The former
are pseudo-instructions for the latter.

llvm-svn: 114221
 2010-09-17 21:58:46 +00:00
Anton Korobeynikov 1bf28a128b Some cheap DAG combine goodness for multiplication with a particular constant. 
This can be extended later on to handle more "complex" constants.

llvm-svn: 103881
 2010-05-15 18:16:59 +00:00
Dan Gohman c8054d90fb Eliminate more uses of llvm-as and llvm-dis. 
llvm-svn: 81293
 2009-09-09 00:09:15 +00:00
Evan Cheng 0d8b0cf3b8 Fix ARM isle code that optimize multiply by constants which are power-of-2 +/- 1. 
llvm-svn: 76520
 2009-07-21 00:31:12 +00:00