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| author | Amaury Sechet <deadalnix@gmail.com> | 2017-04-30 19:24:09 +0000 |
|---|---|---|
| committer | Amaury Sechet <deadalnix@gmail.com> | 2017-04-30 19:24:09 +0000 |
| commit | 8ac81f392424142a2a92e231afda1f637ac59041 (patch) | |
| tree | 9896f9f4edd976167f9b9fe24d8d304abf17f14d /llvm/lib/CodeGen/TargetLoweringBase.cpp | |
| parent | 0c6086f493b0b5208d2e58ad5278322523440ddd (diff) | |
| download | bcm5719-llvm-8ac81f392424142a2a92e231afda1f637ac59041.tar.gz bcm5719-llvm-8ac81f392424142a2a92e231afda1f637ac59041.zip | |
Do not legalize large add with addc/adde, introduce addcarry and do it with uaddo/addcarry
Summary: As per discution on how to get better codegen an large int legalization, it became clear that using a glue for the carry was preventing several desirable optimizations. Passing the carry down as a value allow for more flexibility.
Reviewers: jyknight, nemanjai, mkuper, spatel, RKSimon, zvi, bkramer
Subscribers: igorb, llvm-commits
Differential Revision: https://reviews.llvm.org/D29872
llvm-svn: 301775
Diffstat (limited to 'llvm/lib/CodeGen/TargetLoweringBase.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/TargetLoweringBase.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp index 7474d5ab9dc..39aa946fa84 100644 --- a/llvm/lib/CodeGen/TargetLoweringBase.cpp +++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp @@ -923,6 +923,10 @@ void TargetLoweringBase::initActions() { setOperationAction(ISD::SMULO, VT, Expand); setOperationAction(ISD::UMULO, VT, Expand); + // ADDCARRY operations default to expand + setOperationAction(ISD::ADDCARRY, VT, Expand); + setOperationAction(ISD::SUBCARRY, VT, Expand); + // These default to Expand so they will be expanded to CTLZ/CTTZ by default. setOperationAction(ISD::CTLZ_ZERO_UNDEF, VT, Expand); setOperationAction(ISD::CTTZ_ZERO_UNDEF, VT, Expand); |
