--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -O0 -fast-isel -mtriple=x86_64-- < %s | FileCheck %s
+
+define i32 @test(i64 %arg) nounwind {
+; CHECK-LABEL: test:
+; CHECK: # %bb.0: # %entry
+; CHECK-NEXT: subq $1, %rdi
+; CHECK-NEXT: setb %al
+; CHECK-NEXT: xorl %eax, %eax
+; CHECK-NEXT: movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill
+; CHECK-NEXT: jb .LBB0_2
+; CHECK-NEXT: # %bb.1: # %no_overflow
+; CHECK-NEXT: movl $1, %eax
+; CHECK-NEXT: movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill
+; CHECK-NEXT: jmp .LBB0_2
+; CHECK-NEXT: .LBB0_2: # %merge
+; CHECK-NEXT: movl {{[-0-9]+}}(%r{{[sb]}}p), %eax # 4-byte Reload
+; CHECK-NEXT: retq
+entry:
+ %usubo = tail call { i64, i1 } @llvm.usub.with.overflow.i64(i64 %arg, i64 1)
+ %overflow = extractvalue { i64, i1 } %usubo, 1
+ br i1 %overflow, label %merge, label %no_overflow
+
+no_overflow:
+ br label %merge
+
+merge:
+ %phi = phi i32 [ 1, %no_overflow ], [ 0, %entry ]
+ ret i32 %phi
+}
+
+declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64)