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| author | Duncan Sands <baldrick@free.fr> | 2011-01-14 14:44:12 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2011-01-14 14:44:12 +0000 |
| commit | 571fd9a60652c793c8bdcd7163cd8ee207dc2a84 (patch) | |
| tree | 4b2113b887b5d3b94ab84d90de6c4b86eb685e29 /llvm/test/Transforms/InstSimplify/2011-01-14-Thread.ll | |
| parent | c3eb0f4b2e4ca9e7665c8fe8aeb0f4c15d59f054 (diff) | |
| download | bcm5719-llvm-571fd9a60652c793c8bdcd7163cd8ee207dc2a84.tar.gz bcm5719-llvm-571fd9a60652c793c8bdcd7163cd8ee207dc2a84.zip | |
Factorize common code out of the InstructionSimplify shift logic. Add in
threading of shifts over selects and phis while there. This fires here and
there in the testsuite, to not much effect. For example when compiling spirit
it fires 5 times, during early-cse, resulting in 6 more cse simplifications,
and 3 more terminators being folded by jump threading, but the final bitcode
doesn't change in any interesting way: other optimizations would have caught
the opportunity anyway, only later.
llvm-svn: 123441
Diffstat (limited to 'llvm/test/Transforms/InstSimplify/2011-01-14-Thread.ll')
| -rw-r--r-- | llvm/test/Transforms/InstSimplify/2011-01-14-Thread.ll | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstSimplify/2011-01-14-Thread.ll b/llvm/test/Transforms/InstSimplify/2011-01-14-Thread.ll new file mode 100644 index 00000000000..8fc4dc5d5bb --- /dev/null +++ b/llvm/test/Transforms/InstSimplify/2011-01-14-Thread.ll @@ -0,0 +1,9 @@ +; RUN: opt < %s -instsimplify -S | FileCheck %s + +define i32 @shift_select(i1 %cond) { +; CHECK: @shift_select + %s = select i1 %cond, i32 0, i32 1 + %r = lshr i32 %s, 1 + ret i32 %r +; CHECK: ret i32 0 +} |
