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| author | Hal Finkel <hfinkel@anl.gov> | 2014-03-27 23:12:31 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2014-03-27 23:12:31 +0000 |
| commit | e2ee98ab169fe8d1d4bd39fe0ecb89274eceb438 (patch) | |
| tree | d4f276d3816f78e5f52764f62813ead41fb29df0 /test/CodeGen/PowerPC | |
| parent | d9524d66cd6a69ded63b29bed5413217444b162a (diff) | |
| download | llvm-e2ee98ab169fe8d1d4bd39fe0ecb89274eceb438.tar.gz llvm-e2ee98ab169fe8d1d4bd39fe0ecb89274eceb438.tar.bz2 llvm-e2ee98ab169fe8d1d4bd39fe0ecb89274eceb438.tar.xz | |
[PowerPC] Use a small cleanup pass to remove VSX self copies
As explained in r204976, because of how the allocation of VSX registers
interacts with the call-lowering code, we sometimes end up generating self VSX
copies. Specifically, things like this:
%VSL2<def> = COPY %F2, %VSL2<imp-use,kill>
(where %F2 is really a sub-register of %VSL2, and so this copy is a nop)
This adds a small cleanup pass to remove these prior to post-RA scheduling.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204980 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/PowerPC')
| -rw-r--r-- | test/CodeGen/PowerPC/vsx-self-copy.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/test/CodeGen/PowerPC/vsx-self-copy.ll b/test/CodeGen/PowerPC/vsx-self-copy.ll new file mode 100644 index 0000000000..23615ca10c --- /dev/null +++ b/test/CodeGen/PowerPC/vsx-self-copy.ll @@ -0,0 +1,27 @@ +; RUN: llc -mcpu=pwr7 -mattr=+vsx < %s | FileCheck %s +target datalayout = "E-m:e-i64:64-n32:64" +target triple = "powerpc64-unknown-linux-gnu" + +define double @takFP(double %x, double %y, double %z) #0 { +entry: + br i1 undef, label %if.then, label %return + +if.then: ; preds = %if.then, %entry + %x.tr16 = phi double [ %call, %if.then ], [ %x, %entry ] + %call = tail call double @takFP(double undef, double undef, double undef) + %call4 = tail call double @takFP(double undef, double %x.tr16, double undef) + %cmp = fcmp olt double undef, %call + br i1 %cmp, label %if.then, label %return + +return: ; preds = %if.then, %entry + %z.tr.lcssa = phi double [ %z, %entry ], [ %call4, %if.then ] + ret double %z.tr.lcssa + +; CHECK: @takFP +; CHECK-NOT: xxlor 0, 0, 0 +; CHECK: blr +} + +attributes #0 = { nounwind readnone } +attributes #1 = { nounwind } + |