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| author | Amaury Sechet <deadalnix@gmail.com> | 2017-05-19 18:20:44 +0000 |
|---|---|---|
| committer | Amaury Sechet <deadalnix@gmail.com> | 2017-05-19 18:20:44 +0000 |
| commit | 77cfb4a85f09a8330e5901b37e36b5e3ca597f9d (patch) | |
| tree | fe28eeba0f71730383a29a386ea6d5c122530f2c /llvm/test/CodeGen/X86/overflow.ll | |
| parent | 090871f2061b5760e36133cae9687cc6526b927f (diff) | |
| download | bcm5719-llvm-77cfb4a85f09a8330e5901b37e36b5e3ca597f9d.tar.gz bcm5719-llvm-77cfb4a85f09a8330e5901b37e36b5e3ca597f9d.zip | |
[DAGCombine] (addcarry 0, 0, X) -> (ext/trunc X)
Summary:
While this makes some case better and some case worse - so it's unclear if it is a worthy combine just by itself - this is a useful canonicalisation.
As per discussion in D32756 .
Reviewers: jyknight, nemanjai, mkuper, spatel, RKSimon, zvi, bkramer
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D32916
llvm-svn: 303441
Diffstat (limited to 'llvm/test/CodeGen/X86/overflow.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/overflow.ll | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/llvm/test/CodeGen/X86/overflow.ll b/llvm/test/CodeGen/X86/overflow.ll index ff25b5de493..00dadc4a80f 100644 --- a/llvm/test/CodeGen/X86/overflow.ll +++ b/llvm/test/CodeGen/X86/overflow.ll @@ -27,16 +27,14 @@ define i128 @mulhioverflow(i64 %a, i64 %b, i64 %c) nounwind { ; X32-NEXT: addl $32, %esp ; X32-NEXT: movl {{[0-9]+}}(%esp), %eax ; X32-NEXT: andl $1, %edi -; X32-NEXT: xorl %ecx, %ecx ; X32-NEXT: addl {{[0-9]+}}(%esp), %edi ; X32-NEXT: adcl $0, %eax -; X32-NEXT: adcl $0, %ecx -; X32-NEXT: sbbl %edx, %edx -; X32-NEXT: andl $1, %edx +; X32-NEXT: setb %cl +; X32-NEXT: movzbl %cl, %ecx ; X32-NEXT: movl %edi, (%esi) ; X32-NEXT: movl %eax, 4(%esi) ; X32-NEXT: movl %ecx, 8(%esi) -; X32-NEXT: movl %edx, 12(%esi) +; X32-NEXT: movl $0, 12(%esi) ; X32-NEXT: movl %esi, %eax ; X32-NEXT: leal -8(%ebp), %esp ; X32-NEXT: popl %esi |
