| dce4a407a24b04eebc6a376f8e62b41aaa7b071f |
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29-May-2014 |
Stephen Hines <srhines@google.com> |
Update LLVM for 3.5 rebase (r209712).
Change-Id: I149556c940fb7dc92d075273c87ff584f400941f
/external/llvm/lib/Target/SystemZ/SystemZElimCompare.cpp
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| 36b56886974eae4f9c5ebc96befd3e7bfe5de338 |
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24-Apr-2014 |
Stephen Hines <srhines@google.com> |
Update to LLVM 3.5a.
Change-Id: Ifadecab779f128e62e430c2b4f6ddd84953ed617
/external/llvm/lib/Target/SystemZ/SystemZElimCompare.cpp
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| 29e873ddb6b21c4a934926a0cf7809e98ac1fff0 |
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07-Aug-2013 |
Richard Sandiford <rsandifo@linux.vnet.ibm.com> |
[SystemZ] Optimize floating-point comparisons with zero
This follows the same lines as the integer code. In the end it seemed
easier to have a second 4-bit mask in TSFlags to specify the compare-like
CC values. That eats one more TSFlags bit than adding a CCHasUnordered
would have done, but it feels more concise.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187883 91177308-0d34-0410-b5e6-96231b3b80d8
/external/llvm/lib/Target/SystemZ/SystemZElimCompare.cpp
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| 93795574785de252703591e7fcc8f052c762f25e |
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05-Aug-2013 |
Richard Sandiford <rsandifo@linux.vnet.ibm.com> |
[SystemZ] Use BRCT and BRCTG to eliminate add-&-compare sequences
This patch just uses a peephole test for "add; compare; branch" sequences
within a single block. The IR optimizers already convert loops to
decrement-and-branch-on-nonzero form in some cases, so even this
simplistic test triggers many times during a clang bootstrap and
projects/test-suite run. It looks like there are still cases where we
need to more strongly prefer branches on nonzero though. E.g. I saw a
case where a loop that started out with a check for 0 ended up with a
check for -1. I'll try to look at that sometime.
I ended up adding the Reference class because MachineInstr::readsRegister()
doesn't check for subregisters (by design, as far as I could tell).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187723 91177308-0d34-0410-b5e6-96231b3b80d8
/external/llvm/lib/Target/SystemZ/SystemZElimCompare.cpp
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| 9b05c709c65ba05645853ca49bc2a1ea8b554f37 |
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05-Aug-2013 |
Richard Sandiford <rsandifo@linux.vnet.ibm.com> |
[SystemZ] Use LOAD AND TEST to eliminate comparisons against zero
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187720 91177308-0d34-0410-b5e6-96231b3b80d8
/external/llvm/lib/Target/SystemZ/SystemZElimCompare.cpp
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| 66fbb4781841a8411a772b6909a7e0de182b896f |
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05-Aug-2013 |
Richard Sandiford <rsandifo@linux.vnet.ibm.com> |
[SystemZ] Split out comparison elimination into a separate pass
Perhaps predictably, doing comparison elimination on the fly during
SystemZLongBranch turned out to be a bad idea. The next patches make
use of LOAD AND TEST and BRANCH ON COUNT, both of which require
changes to earlier instructions.
No functionality change intended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187718 91177308-0d34-0410-b5e6-96231b3b80d8
/external/llvm/lib/Target/SystemZ/SystemZElimCompare.cpp
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