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| author | Dan Gohman <dan433584@gmail.com> | 2016-01-20 23:16:59 +0000 |
|---|---|---|
| committer | Dan Gohman <dan433584@gmail.com> | 2016-01-20 23:16:59 +0000 |
| commit | 760bef5e508c985bf9216d81adfc20a657d77611 (patch) | |
| tree | 3e2b0d38f819e7f1b5ad416b249034203f07697c /llvm/test | |
| parent | 10badfc924871e020981a12705dcec9544912278 (diff) | |
| download | bcm5719-llvm-760bef5e508c985bf9216d81adfc20a657d77611.tar.gz bcm5719-llvm-760bef5e508c985bf9216d81adfc20a657d77611.zip | |
[SelectionDAG] Fix constant offset folding to avoid commuting non-commutative operators.
This fixes a miscompile in MultiSource/Benchmarks/MiBench/consumer-lame
introduced in r258296.
llvm-svn: 258366
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/CodeGen/X86/negative-offset.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/negative-offset.ll b/llvm/test/CodeGen/X86/negative-offset.ll new file mode 100644 index 00000000000..dc1b255d020 --- /dev/null +++ b/llvm/test/CodeGen/X86/negative-offset.ll @@ -0,0 +1,18 @@ +; RUN: llc < %s -asm-verbose=false | FileCheck %s + +target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-unknown-linux-gnu" + +; Test that a constant consisting of a global symbol with a negative offset +; is properly folded and isel'd. + +; CHECK-LABEL: negative_offset: +; CHECK: movl $G, %eax +; CHECK: notq %rax +; CHECK: addq %rdi, %rax +; CHECK: retq +@G = external global [8 x i32] +define i8* @negative_offset(i8* %a) { + %t = getelementptr i8, i8* %a, i64 sub (i64 -1, i64 ptrtoint ([8 x i32]* @G to i64)) + ret i8* %t +} |
