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| author | Hal Finkel <hfinkel@anl.gov> | 2013-07-01 19:34:59 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-07-01 19:34:59 +0000 |
| commit | 25e4a0d41826266b210dd5348052492977a0c587 (patch) | |
| tree | 35a55c898b5a86cbcf156314a1be1347ab1770ca /llvm/test/CodeGen/PowerPC/ctrloop-large-ec.ll | |
| parent | 8625fd8cad18731d042dad5f22ad926ed9f99b66 (diff) | |
| download | bcm5719-llvm-25e4a0d41826266b210dd5348052492977a0c587.tar.gz bcm5719-llvm-25e4a0d41826266b210dd5348052492977a0c587.zip | |
Don't form PPC CTR loops for over-sized exit counts
Although you can't generate this from C on PPC64, if you have a loop using a
64-bit counter on PPC32 then you can't form a CTR-based loop for it. This had
been cauing the PPCCTRLoops pass to assert.
Thanks to Joerg Sonnenberger for providing a test case!
llvm-svn: 185361
Diffstat (limited to 'llvm/test/CodeGen/PowerPC/ctrloop-large-ec.ll')
| -rw-r--r-- | llvm/test/CodeGen/PowerPC/ctrloop-large-ec.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/PowerPC/ctrloop-large-ec.ll b/llvm/test/CodeGen/PowerPC/ctrloop-large-ec.ll new file mode 100644 index 00000000000..c18bdabdb03 --- /dev/null +++ b/llvm/test/CodeGen/PowerPC/ctrloop-large-ec.ll @@ -0,0 +1,23 @@ +; RUN: llc -mcpu=ppc32 < %s +target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32" +target triple = "powerpc-unknown-linux-gnu" + +define void @fn1() { +entry: + br i1 undef, label %for.end, label %for.body + +for.body: ; preds = %for.body, %entry + %inc3 = phi i64 [ %inc, %for.body ], [ undef, %entry ] + %inc = add nsw i64 %inc3, 1 + %tobool = icmp eq i64 %inc, 0 + br i1 %tobool, label %for.end, label %for.body + +for.end: ; preds = %for.body, %entry + ret void +} + +; On PPC32, CTR is also 32 bits, and so cannot hold a 64-bit count. +; CHECK: @fn1 +; CHECK-NOT: mtctr +; CHECK: blr + |
