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| author | Eli Friedman <eli.friedman@gmail.com> | 2008-12-17 03:35:17 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2008-12-17 03:35:17 +0000 |
| commit | 28dc98f7521933872b93156e3ebf5c9f8327b2b3 (patch) | |
| tree | 13fc73e52fccdbe7506aeda590b5ebec9a32bd88 /test/CodeGen/X86/2008-12-16-BadShift.ll | |
| parent | 2d0484c02cc99e30f320dec376b102ad7a961904 (diff) | |
| download | external_llvm-28dc98f7521933872b93156e3ebf5c9f8327b2b3.zip external_llvm-28dc98f7521933872b93156e3ebf5c9f8327b2b3.tar.gz external_llvm-28dc98f7521933872b93156e3ebf5c9f8327b2b3.tar.bz2 | |
Fix for PR3225: disable a broken optimization in
DAGTypeLegalizer::ExpandShiftWithKnownAmountBit.
In terms of restoring the optimization, the best fix here isn't
obvious... any ideas?
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61119 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/2008-12-16-BadShift.ll')
| -rw-r--r-- | test/CodeGen/X86/2008-12-16-BadShift.ll | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2008-12-16-BadShift.ll b/test/CodeGen/X86/2008-12-16-BadShift.ll new file mode 100644 index 0000000..46b7018 --- /dev/null +++ b/test/CodeGen/X86/2008-12-16-BadShift.ll @@ -0,0 +1,19 @@ +; RUN: llvm-as < %s | llc | not grep shrl +; Note: this test is really trying to make sure that the shift +; returns the right result; shrl is most likely wrong, +; but if CodeGen starts legitimately using an shrl here, +; please adjust the test appropriately. + +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32" +target triple = "i386-pc-linux-gnu" +@.str = internal constant [6 x i8] c"%lld\0A\00" ; <[6 x i8]*> [#uses=1] + +define i64 @mebbe_shift(i32 %xx, i32 %test) nounwind { +entry: + %conv = zext i32 %xx to i64 ; <i64> [#uses=1] + %tobool = icmp ne i32 %test, 0 ; <i1> [#uses=1] + %shl = select i1 %tobool, i64 3, i64 0 ; <i64> [#uses=1] + %x.0 = shl i64 %conv, %shl ; <i64> [#uses=1] + ret i64 %x.0 +} + |