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| author | Dan Gohman <gohman@apple.com> | 2009-02-18 17:22:41 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-02-18 17:22:41 +0000 |
| commit | f5a309e989b8d2199cb542793e9edf48395d9fed (patch) | |
| tree | c52543300d485f04baebd2bc1ee8f1fb7721a411 /test/Transforms/IndVarSimplify/promote-iv-to-eliminate-casts.ll | |
| parent | cad24c9abc834db5cf8f92019f99370507d8d07a (diff) | |
| download | external_llvm-f5a309e989b8d2199cb542793e9edf48395d9fed.zip external_llvm-f5a309e989b8d2199cb542793e9edf48395d9fed.tar.gz external_llvm-f5a309e989b8d2199cb542793e9edf48395d9fed.tar.bz2 | |
Use a sign-extend instead of a zero-extend when promoting a
trip count value when the original loop iteration condition is
signed and the canonical induction variable won't undergo signed
overflow. This isn't required for correctness; it just preserves
more information about original loop iteration values.
Add a getTruncateOrSignExtend method to ScalarEvolution,
following getTruncateOrZeroExtend.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64918 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/IndVarSimplify/promote-iv-to-eliminate-casts.ll')
| -rw-r--r-- | test/Transforms/IndVarSimplify/promote-iv-to-eliminate-casts.ll | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/test/Transforms/IndVarSimplify/promote-iv-to-eliminate-casts.ll b/test/Transforms/IndVarSimplify/promote-iv-to-eliminate-casts.ll index 08b08f2..9588bd3 100644 --- a/test/Transforms/IndVarSimplify/promote-iv-to-eliminate-casts.ll +++ b/test/Transforms/IndVarSimplify/promote-iv-to-eliminate-casts.ll @@ -1,6 +1,7 @@ -; RUN: llvm-as < %s | opt -indvars | llvm-dis | not grep sext - -target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128" +; RUN: llvm-as < %s | opt -indvars | llvm-dis > %t +; RUN: grep sext %t | count 2 +; RUN: grep { = sext i16 %N to i64} %t +; RUN: grep { = sext i32 %count to i64} %t define i64 @test(i64* nocapture %first, i32 %count) nounwind readonly { entry: |