llvm-6502/test/Analysis/BranchProbabilityInfo
Hal Finkel e14fb07357 Consider (x == -1) unlikely in BranchProbabilityInfo
This adds another heuristic to BPI, similar to the existing heuristic that
considers (x == 0) unlikely to be true. As suggested in the PACT'98 paper by
Deitrich, Cheng, and Hwu, -1 is often used to indicate an invalid index, and
equality comparisons with -1 are also unlikely to succeed. Local
experimentation supports this hypothesis: This yields a 1-2% speedup in the
test-suite sqlite benchmark on the PPC A2 core, with no significant
regressions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193855 91177308-0d34-0410-b5e6-96231b3b80d8
2013-11-01 10:58:22 +00:00
..
basic.ll Consider (x == -1) unlikely in BranchProbabilityInfo 2013-11-01 10:58:22 +00:00
loop.ll Fix the API usage in loop probability heuristics. It was incorrectly 2011-10-25 09:47:41 +00:00
noreturn.ll Make the unreachable probability much much heavier. The previous 2011-12-22 09:26:37 +00:00