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| author | Andrew Trick <atrick@apple.com> | 2011-06-21 03:22:38 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2011-06-21 03:22:38 +0000 |
| commit | 69d4452f2e04f7b1d118bc0d8e6b09898ea547bc (patch) | |
| tree | 00d58dd9ca5b41ab21a6350978450334cb1f2896 /llvm/test/Transforms | |
| parent | 5364847a84272b0a8ade22f2a2e97cfead90eb33 (diff) | |
| download | bcm5719-llvm-69d4452f2e04f7b1d118bc0d8e6b09898ea547bc.tar.gz bcm5719-llvm-69d4452f2e04f7b1d118bc0d8e6b09898ea547bc.zip | |
indvars -disable-iv-rewrite: Adds support for eliminating identity
ops.
This is a rewrite of the IV simplification algorithm used by
-disable-iv-rewrite. To avoid perturbing the default mode, I
temporarily split the driver and created SimplifyIVUsersNoRewrite. The
idea is to avoid doing opcode/pattern matching inside
IndVarSimplify. SCEV already does it. We want to optimize with the
full generality of SCEV, but optimize def-use chains top down on-demand rather
than rewriting the entire expression bottom-up. This was easy to do
for operations that SCEV can prove are identity function. So we're now
eliminating bitmasks and zero extends this way.
A result of this rewrite is that indvars -disable-iv-rewrite no longer
requires IVUsers.
llvm-svn: 133502
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/IndVarSimplify/iv-zext.ll | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/test/Transforms/IndVarSimplify/iv-zext.ll b/llvm/test/Transforms/IndVarSimplify/iv-zext.ll index 00018ec6f17..3a05c893fb4 100644 --- a/llvm/test/Transforms/IndVarSimplify/iv-zext.ll +++ b/llvm/test/Transforms/IndVarSimplify/iv-zext.ll @@ -1,4 +1,5 @@ ; RUN: opt < %s -indvars -S | FileCheck %s +; RUN: opt < %s -indvars -disable-iv-rewrite -S | FileCheck %s ; CHECK-NOT: and ; CHECK-NOT: zext |
