[PATCH] D19999: [X86] Teach X86FixupBWInsts to promote MOV8rr/MOV16rr to MOV32rr.

[Ahmed Bougacha via llvm-commits]

ab marked 2 inline comments as done.
ab added a comment.

Not much changes in the test-suite (+SPEC ref) but a couple improvements:

| Benchmark_Exec_Time                               | Delta  | Previous | Current  | StdDev |
| SingleSource/Benchmarks/BenchmarkGame/nsieve-bits | -1.99% | 0.8247   | 0.8083   | 0.0037 |
| MultiSource/Benchmarks/nbench/nbench              | -1.68% | 6.1993   | 6.0949   | 0.0085 |
| LNT/CINT2006_ref/445.gobmk                        | -1.16% | 524.3664 | 518.3037 | 1.2114 |


http://reviews.llvm.org/D19999