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Add test case for add to sub transformation. NFC 

llvm-svn: 355269
This commit is contained in:
Amaury Sechet 2019-03-02 14:28:59 +00:00
parent f436f70fb8
commit 31291a403c
1 changed files with 30 additions and 0 deletions
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30
llvm/test/CodeGen/X86/add.ll
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@ -477,3 +477,33 @@ define void @uaddo1_not(i32 %a, i32* %p0, i1* %p1) {
store i1 %r1, i1* %p1
ret void
}
define i32 @add_to_sub(i32 %a, i32 %b) {
; X32-LABEL: add_to_sub:
; X32: # %bb.0:
; X32-NEXT: movl {{[0-9]+}}(%esp), %eax
; X32-NEXT: movl {{[0-9]+}}(%esp), %ecx
; X32-NEXT: notl %ecx
; X32-NEXT: leal 1(%ecx,%eax), %eax
; X32-NEXT: retl
;
; X64-LINUX-LABEL: add_to_sub:
; X64-LINUX: # %bb.0:
; X64-LINUX-NEXT: # kill: def $esi killed $esi def $rsi
; X64-LINUX-NEXT: # kill: def $edi killed $edi def $rdi
; X64-LINUX-NEXT: notl %edi
; X64-LINUX-NEXT: leal 1(%rdi,%rsi), %eax
; X64-LINUX-NEXT: retq
;
; X64-WIN32-LABEL: add_to_sub:
; X64-WIN32: # %bb.0:
; X64-WIN32-NEXT: # kill: def $edx killed $edx def $rdx
; X64-WIN32-NEXT: # kill: def $ecx killed $ecx def $rcx
; X64-WIN32-NEXT: notl %ecx
; X64-WIN32-NEXT: leal 1(%rcx,%rdx), %eax
; X64-WIN32-NEXT: retq
%nota = xor i32 %a, -1
%add = add i32 %nota, %b
%r = add i32 %add, 1
ret i32 %r
}