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| author | Amaury Sechet <deadalnix@gmail.com> | 2017-02-06 14:28:39 +0000 |
|---|---|---|
| committer | Amaury Sechet <deadalnix@gmail.com> | 2017-02-06 14:28:39 +0000 |
| commit | 1d466f598e91cc26c07ffc52e842fe1f1d27be0b (patch) | |
| tree | 429687266a3080942bdbc1bd4b50c34296907262 /llvm | |
| parent | bdf3c5af6adf7d30cee7c6c1d9fb3d0b33df3789 (diff) | |
| download | bcm5719-llvm-1d466f598e91cc26c07ffc52e842fe1f1d27be0b.tar.gz bcm5719-llvm-1d466f598e91cc26c07ffc52e842fe1f1d27be0b.zip | |
[DAGCombiner] (add X, (adde Y, 0, Carry)) -> (adde X, Y, Carry)
Summary: This is extracted from D29443 .
Reviewers: mkuper, spatel, RKSimon, zvi, bkramer
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D29564
llvm-svn: 294186
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 | ||||
| -rw-r--r-- | llvm/test/CodeGen/X86/adde-carry.ll | 13 |
2 files changed, 12 insertions, 7 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 8028eb3567e..60a62ed39f2 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1834,6 +1834,12 @@ SDValue DAGCombiner::visitADDLike(SDValue N0, SDValue N1, SDNode *LocReference) } } + // (add X, (adde Y, 0, Carry)) -> (adde X, Y, Carry) + if (N1.getOpcode() == ISD::ADDE && N1->hasOneUse() && + isNullConstant(N1.getOperand(1))) + return DAG.getNode(ISD::ADDE, DL, DAG.getVTList(VT, MVT::Glue), + N0, N1->getOperand(0), N1->getOperand(2)); + return SDValue(); } diff --git a/llvm/test/CodeGen/X86/adde-carry.ll b/llvm/test/CodeGen/X86/adde-carry.ll index e111f683dd3..62e7e7f8124 100644 --- a/llvm/test/CodeGen/X86/adde-carry.ll +++ b/llvm/test/CodeGen/X86/adde-carry.ll @@ -93,17 +93,16 @@ define %scalar @pr31719(%scalar* nocapture readonly %this, %scalar %arg.b) { ; CHECK-NEXT: sbbq %r10, %r10 ; CHECK-NEXT: andl $1, %r10d ; CHECK-NEXT: addq 8(%rsi), %rcx -; CHECK-NEXT: sbbq %r11, %r11 -; CHECK-NEXT: andl $1, %r11d -; CHECK-NEXT: addq %r10, %rcx -; CHECK-NEXT: adcq $0, %r11 -; CHECK-NEXT: addq 16(%rsi), %r8 ; CHECK-NEXT: sbbq %rax, %rax ; CHECK-NEXT: andl $1, %eax -; CHECK-NEXT: addq %r11, %r8 +; CHECK-NEXT: addq %r10, %rcx ; CHECK-NEXT: adcq $0, %rax +; CHECK-NEXT: addq 16(%rsi), %r8 +; CHECK-NEXT: sbbq %r10, %r10 +; CHECK-NEXT: andl $1, %r10d ; CHECK-NEXT: addq 24(%rsi), %r9 -; CHECK-NEXT: addq %rax, %r9 +; CHECK-NEXT: addq %rax, %r8 +; CHECK-NEXT: adcq %r10, %r9 ; CHECK-NEXT: movq %rdx, (%rdi) ; CHECK-NEXT: movq %rcx, 8(%rdi) ; CHECK-NEXT: movq %r8, 16(%rdi) |
