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indvars -disable-iv-rewrite: run RLEV after SimplifyIVUsers for

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a bit more control over the order SCEVs are evaluated.

llvm-svn: 133959
This commit is contained in:
Andrew Trick 2011-06-27 23:17:44 +00:00
parent c4a49e5afd
commit a2083f5887
1 changed files with 6 additions and 4 deletions
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10
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -1158,8 +1158,12 @@ bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
// Create a rewriter object which we'll use to transform the code with.
SCEVExpander Rewriter(*SE);
if (DisableIVRewrite)
// Eliminate redundant IV users.
if (DisableIVRewrite) {
Rewriter.disableCanonicalMode();
SimplifyIVUsersNoRewrite(L, Rewriter);
}
// Check to see if this loop has a computable loop-invariant execution count.
// If so, this means that we can compute the final value of any expressions
@ -1171,9 +1175,7 @@ bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
RewriteLoopExitValues(L, Rewriter);
// Eliminate redundant IV users.
if (DisableIVRewrite)
SimplifyIVUsersNoRewrite(L, Rewriter);
else
if (!DisableIVRewrite)
SimplifyIVUsers(Rewriter);
// Compute the type of the largest recurrence expression, and decide whether