1 ; RUN: opt -simplifycfg -S < %s | FileCheck %s 2 3 declare { i32, i1 } @llvm.uadd.with.overflow.i32(i32, i32) #1 4 5 define i32 @f(i32 %a, i32 %b) #0 { 6 entry: 7 %uadd = tail call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 %a, i32 %b) 8 %cmp = extractvalue { i32, i1 } %uadd, 1 9 br i1 %cmp, label %return, label %if.end 10 11 if.end: ; preds = %entry 12 %0 = extractvalue { i32, i1 } %uadd, 0 13 br label %return 14 15 return: ; preds = %entry, %if.end 16 %retval.0 = phi i32 [ %0, %if.end ], [ 0, %entry ] 17 ret i32 %retval.0 18 19 ; CHECK-LABEL: @f( 20 ; CHECK-NOT: phi 21 ; CHECK: select 22 } 23
