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5 Commits

Author SHA1 Message Date
Nick Lewycky d4192f71b5 Simplify some code with no functionality change. Make the test a lot more 
robust against smarter optimizations, using the power of FileCheck.

llvm-svn: 124081
 2011-01-23 20:06:05 +00:00
Nick Lewycky bc98f5b78e Use value ranges to fold ext(trunc) in SCEV when possible. 
llvm-svn: 124062
 2011-01-23 06:20:19 +00:00
Nick Lewycky 5c901f3489 Similarly, analyze truncate through multiply. 
llvm-svn: 123842
 2011-01-19 18:56:00 +00:00
Nick Lewycky 5143f0f09b Add a missed SCEV fold that is required to continue analyzing the IR produced 
by indvars through the scev expander.

trunc(add x, y) --> add(trunc x, y). Currently SCEV largely folds the other way
which is probably wrong, but preserved to minimize churn. Instcombine doesn't
do this fold either, demonstrating a missed optz'n opportunity on code doing
add+trunc+add.

llvm-svn: 123838
 2011-01-19 16:59:46 +00:00
Nick Lewycky e9ea75e3fc Add a missing SCEV simplification sext(zext x) --> zext x. 
llvm-svn: 123832
 2011-01-19 15:56:12 +00:00