[X86] Add addcarry/subborrow combine tests

Show failure to simplify cases with zero op/flags

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352196 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/combine-adx.ll b/test/CodeGen/X86/combine-adx.ll
new file mode 100644 (file)
index 0000000..15d3918
--- /dev/null
+++ b/test/CodeGen/X86/combine-adx.ll
@@ -0,0 +1,74 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefixes=X86
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefixes=X64
+
+define i32 @test_addcarry_32_x_0_false(i32 %a0)  {
+; X86-LABEL: test_addcarry_32_x_0_false:
+; X86:       # %bb.0:
+; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    addl $0, %eax
+; X86-NEXT:    retl
+;
+; X64-LABEL: test_addcarry_32_x_0_false:
+; X64:       # %bb.0:
+; X64-NEXT:    # kill: def $edi killed $edi def $rdi
+; X64-NEXT:    leal (%rdi), %eax
+; X64-NEXT:    retq
+  %1 = tail call { i8, i32 } @llvm.x86.addcarry.32(i8 0, i32 %a0, i32 0)
+  %2 = extractvalue { i8, i32 } %1, 1
+  ret i32 %2
+}
+
+define i32 @test_addcarry_32_0_x_false(i32 %a0)  {
+; X86-LABEL: test_addcarry_32_0_x_false:
+; X86:       # %bb.0:
+; X86-NEXT:    xorl %eax, %eax
+; X86-NEXT:    addl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    retl
+;
+; X64-LABEL: test_addcarry_32_0_x_false:
+; X64:       # %bb.0:
+; X64-NEXT:    # kill: def $edi killed $edi def $rdi
+; X64-NEXT:    leal (%rdi), %eax
+; X64-NEXT:    retq
+  %1 = tail call { i8, i32 } @llvm.x86.addcarry.32(i8 0, i32 0, i32 %a0)
+  %2 = extractvalue { i8, i32 } %1, 1
+  ret i32 %2
+}
+
+define i32 @test_subborrow_32_x_0_false(i32 %a0)  {
+; X86-LABEL: test_subborrow_32_x_0_false:
+; X86:       # %bb.0:
+; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    subl $0, %eax
+; X86-NEXT:    retl
+;
+; X64-LABEL: test_subborrow_32_x_0_false:
+; X64:       # %bb.0:
+; X64-NEXT:    movl %edi, %eax
+; X64-NEXT:    subl $0, %eax
+; X64-NEXT:    retq
+  %1 = tail call { i8, i32 } @llvm.x86.subborrow.32(i8 0, i32 %a0, i32 0)
+  %2 = extractvalue { i8, i32 } %1, 1
+  ret i32 %2
+}
+
+define i32 @test_subborrow_32_0_x_false(i32 %a0)  {
+; X86-LABEL: test_subborrow_32_0_x_false:
+; X86:       # %bb.0:
+; X86-NEXT:    xorl %eax, %eax
+; X86-NEXT:    subl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    retl
+;
+; X64-LABEL: test_subborrow_32_0_x_false:
+; X64:       # %bb.0:
+; X64-NEXT:    movl %edi, %eax
+; X64-NEXT:    negl %eax
+; X64-NEXT:    retq
+  %1 = tail call { i8, i32 } @llvm.x86.subborrow.32(i8 0, i32 0, i32 %a0)
+  %2 = extractvalue { i8, i32 } %1, 1
+  ret i32 %2
+}
+
+declare { i8, i32 } @llvm.x86.addcarry.32(i8, i32, i32)
+declare { i8, i32 } @llvm.x86.subborrow.32(i8, i32, i32)