| commit | c087e20331c8a4c3b77d96a73588e80c06d89e3d | [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 | 94ac52a66a86f73e2f0331a997aae1964ed3aacc | |
| parent | cf80bc1d4ac741620641c2bf48c25993bd478bd0 [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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123442 91177308-0d34-0410-b5e6-96231b3b80d8