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| author | Owen Anderson <resistor@mac.com> | 2013-07-26 21:40:29 +0000 |
|---|---|---|
| committer | Owen Anderson <resistor@mac.com> | 2013-07-26 21:40:29 +0000 |
| commit | 0c326f07ca713fa00d0dcba8ec9b61e91298f690 (patch) | |
| tree | 7799e51b91aa712aa13e7cb0a34e2730ad69dec1 /test/Transforms/InstCombine/fneg-ext.ll | |
| parent | d063a326b2567c3ca759f069e7680979036b9d5e (diff) | |
| download | llvm-0c326f07ca713fa00d0dcba8ec9b61e91298f690.tar.gz llvm-0c326f07ca713fa00d0dcba8ec9b61e91298f690.tar.bz2 llvm-0c326f07ca713fa00d0dcba8ec9b61e91298f690.tar.xz | |
When InstCombine tries to fold away (fsub x, (fneg y)) into (fadd x, y), it is
also worthwhile for it to look through FP extensions and truncations, whose
application commutes with fneg.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187249 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/fneg-ext.ll')
| -rw-r--r-- | test/Transforms/InstCombine/fneg-ext.ll | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/fneg-ext.ll b/test/Transforms/InstCombine/fneg-ext.ll new file mode 100644 index 0000000000..49ad232526 --- /dev/null +++ b/test/Transforms/InstCombine/fneg-ext.ll @@ -0,0 +1,12 @@ +; RUN: opt -instcombine -S < %s | FileCheck %s + +; CHECK: test1 +define double @test1(float %a, double %b) nounwind readnone ssp uwtable { +; CHECK-NOT: fsub +; CHECK: fpext +; CHECK: fadd + %1 = fsub float -0.000000e+00, %a + %2 = fpext float %1 to double + %3 = fsub double %b, %2 + ret double %3 +} |