Add test case for add to sub transformation. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355269 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/add.ll b/test/CodeGen/X86/add.ll
index a8c254f4b0fe065c70ef8426074f28b4e742a56c..c54711a93a73e6a280831f4f7c52dcfe0f5159ed 100644 (file)
--- a/test/CodeGen/X86/add.ll
+++ b/test/CodeGen/X86/add.ll
@@ -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
+}