| commit | d6f1a9584d72d11e652adc34fc9f5d911eee8e8c | [log] [tgz] |
|---|---|---|
| author | Duncan Sands <baldrick@free.fr> | Fri Jan 14 15:26:10 2011 +0000 |
| committer | Duncan Sands <baldrick@free.fr> | Fri Jan 14 15:26:10 2011 +0000 |
| tree | f859e4dab89d939437f97f2c62d9679ab1c3a5fc | |
| parent | 571fd9a60652c793c8bdcd7163cd8ee207dc2a84 [diff] |
Turn X-(X-Y) into Y. According to my auto-simplifier this is the most common simplification present in fully optimized code (I think instcombine fails to transform some of these when "X-Y" has more than one use). Fires here and there all over the test-suite, for example it eliminates 8 subtractions in the final IR for 445.gobmk, 2 subs in 447.dealII, 2 in paq8p etc. llvm-svn: 123442