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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 | b5f7b0f9780cd1bc6f948b194adfc57176d41711 (patch) | |
| tree | 8e420c6c590a8bc8cff2845039b59a5209cbf4ec /lib | |
| parent | 6711fc28a41c05e1c8398393c7794c41b2ee0202 (diff) | |
| download | external_llvm-b5f7b0f9780cd1bc6f948b194adfc57176d41711.zip external_llvm-b5f7b0f9780cd1bc6f948b194adfc57176d41711.tar.gz external_llvm-b5f7b0f9780cd1bc6f948b194adfc57176d41711.tar.bz2 | |
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!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185361 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/PowerPC/PPCCTRLoops.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCCTRLoops.cpp b/lib/Target/PowerPC/PPCCTRLoops.cpp index 08247c2..bfc9495 100644 --- a/lib/Target/PowerPC/PPCCTRLoops.cpp +++ b/lib/Target/PowerPC/PPCCTRLoops.cpp @@ -415,6 +415,9 @@ bool PPCCTRLoops::convertToCTRLoop(Loop *L) { } else if (!SE->isLoopInvariant(EC, L)) continue; + if (SE->getTypeSizeInBits(EC->getType()) > (TT.isArch64Bit() ? 64 : 32)) + continue; + // We now have a loop-invariant count of loop iterations (which is not the // constant zero) for which we know that this loop will not exit via this // exisiting block. |