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| author | Nadav Rotem <nrotem@apple.com> | 2012-09-13 14:54:28 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-09-13 14:54:28 +0000 |
| commit | 91a7e0184a4f7976ef11cb48697d2782fc1b9be7 (patch) | |
| tree | 2dd9e6c2fbd94d6225a3e9e154d37a1756fed052 /test/CodeGen/X86/2012-09-13-dagco-fneg.ll | |
| parent | faf31d01db913b477b749c9f11f18a9471c0a672 (diff) | |
| download | llvm-91a7e0184a4f7976ef11cb48697d2782fc1b9be7.tar.gz llvm-91a7e0184a4f7976ef11cb48697d2782fc1b9be7.tar.bz2 llvm-91a7e0184a4f7976ef11cb48697d2782fc1b9be7.tar.xz | |
Fix a dagcombine optimization. The optimization attempts to optimize a bitcast of fneg to integers
by xoring the high-bit. This fails if the source operand is a vector because we need to negate
each of the elements in the vector.
Fix rdar://12281066 PR13813.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163802 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/2012-09-13-dagco-fneg.ll')
| -rw-r--r-- | test/CodeGen/X86/2012-09-13-dagco-fneg.ll | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2012-09-13-dagco-fneg.ll b/test/CodeGen/X86/2012-09-13-dagco-fneg.ll new file mode 100644 index 0000000000..7b9bab97be --- /dev/null +++ b/test/CodeGen/X86/2012-09-13-dagco-fneg.ll @@ -0,0 +1,21 @@ +; RUN: llc -march=x86-64 -mcpu=corei7 < %s | FileCheck %s + +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-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.8.0" + +; CHECK: foo +; Make sure we are not trying to use scalar xor on the high bits of the vector. +; CHECK-NOT: xorq +; CHECK: xorl +; CHECK-NEXT: ret + +define i32 @foo() { +bb: + %tmp44.i = fsub <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, <float 0.000000e+00, float 0.000000e+00, float 1.000000e+00, float 0.000000e+00> + %0 = bitcast <4 x float> %tmp44.i to i128 + %1 = zext i128 %0 to i512 + %2 = shl nuw nsw i512 %1, 256 + %ins = or i512 %2, 3325764857622480139933400731976840738652108318779753826115024029985671937147149347761402413803120180680770390816681124225944317364750115981129923635970048 + store i512 %ins, i512* undef, align 64 + ret i32 0 +} |