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| author | Craig Topper <craig.topper@intel.com> | 2019-07-04 18:18:46 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2019-07-04 18:18:46 +0000 |
| commit | e9aed963ce36cd3af88abac77e98d2521ef8961e (patch) | |
| tree | bcba8fa8b43119c72bc6694818ca6f5473511ede /llvm/test/CodeGen/X86/add-of-carry.ll | |
| parent | 5816889c748b37e1c3f48e8799a3478cf5931f60 (diff) | |
| download | bcm5719-llvm-e9aed963ce36cd3af88abac77e98d2521ef8961e.tar.gz bcm5719-llvm-e9aed963ce36cd3af88abac77e98d2521ef8961e.zip | |
[DAGCombiner] Don't combine (addcarry (uaddo X, Y), 0, Carry) -> (addcarry X, Y, Carry) if the Carry comes from the uaddo.
Summary:
The uaddo won't be removed and the addcarry will still be
dependent on the uaddo. So we'll just increase the use count
of X and Y and potentially require a COPY.
Reviewers: spatel, RKSimon, deadalnix
Reviewed By: RKSimon
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D64190
llvm-svn: 365149
Diffstat (limited to 'llvm/test/CodeGen/X86/add-of-carry.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/add-of-carry.ll | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/llvm/test/CodeGen/X86/add-of-carry.ll b/llvm/test/CodeGen/X86/add-of-carry.ll index 1149ae57552..9bb50de25b2 100644 --- a/llvm/test/CodeGen/X86/add-of-carry.ll +++ b/llvm/test/CodeGen/X86/add-of-carry.ll @@ -9,11 +9,9 @@ define i32 @test1(i32 %sum, i32 %x) nounwind readnone ssp { ; CHECK-LABEL: test1: ; CHECK: # %bb.0: -; CHECK-NEXT: movl {{[0-9]+}}(%esp), %ecx ; CHECK-NEXT: movl {{[0-9]+}}(%esp), %eax -; CHECK-NEXT: movl %eax, %edx -; CHECK-NEXT: addl %ecx, %edx -; CHECK-NEXT: adcl %ecx, %eax +; CHECK-NEXT: addl {{[0-9]+}}(%esp), %eax +; CHECK-NEXT: adcl $0, %eax ; CHECK-NEXT: retl %add4 = add i32 %x, %sum %cmp = icmp ult i32 %add4, %x |
