; RUN: opt -S -instcombine < %s | FileCheck %s ; <rdar://problem/8558713> declare void @throwAnExceptionOrWhatever() ; CHECK: @test1 define i32 @test1(i32 %a, i32 %b) nounwind ssp { entry: ; CHECK-NOT: sext %conv = sext i32 %a to i64 %conv2 = sext i32 %b to i64 %add = add nsw i64 %conv2, %conv %add.off = add i64 %add, 2147483648 ; CHECK: llvm.sadd.with.overflow.i32 %0 = icmp ugt i64 %add.off, 4294967295 br i1 %0, label %if.then, label %if.end if.then: tail call void @throwAnExceptionOrWhatever() nounwind br label %if.end if.end: ; CHECK-NOT: trunc %conv9 = trunc i64 %add to i32 ; CHECK: ret i32 ret i32 %conv9 } ; CHECK: @test2 ; This form should not be promoted for two reasons: 1) it is unprofitable to ; promote it since the add.off instruction has another use, and 2) it is unsafe ; because the add-with-off makes the high bits of the original add live. define i32 @test2(i32 %a, i32 %b, i64* %P) nounwind ssp { entry: %conv = sext i32 %a to i64 %conv2 = sext i32 %b to i64 %add = add nsw i64 %conv2, %conv %add.off = add i64 %add, 2147483648 store i64 %add.off, i64* %P ; CHECK-NOT: llvm.sadd.with.overflow %0 = icmp ugt i64 %add.off, 4294967295 br i1 %0, label %if.then, label %if.end if.then: tail call void @throwAnExceptionOrWhatever() nounwind br label %if.end if.end: %conv9 = trunc i64 %add to i32 ; CHECK: ret i32 ret i32 %conv9 } ; CHECK: test3 ; PR8816 ; This is illegal to transform because the high bits of the original add are ; live out. define i64 @test3(i32 %a, i32 %b) nounwind ssp { entry: %conv = sext i32 %a to i64 %conv2 = sext i32 %b to i64 %add = add nsw i64 %conv2, %conv %add.off = add i64 %add, 2147483648 ; CHECK-NOT: llvm.sadd.with.overflow %0 = icmp ugt i64 %add.off, 4294967295 br i1 %0, label %if.then, label %if.end if.then: tail call void @throwAnExceptionOrWhatever() nounwind br label %if.end if.end: ret i64 %add ; CHECK: ret i64 } ; CHECK: @test4 ; Should be able to form an i8 sadd computed in an i32. define zeroext i8 @test4(i8 signext %a, i8 signext %b) nounwind ssp { entry: %conv = sext i8 %a to i32 %conv2 = sext i8 %b to i32 %add = add nsw i32 %conv2, %conv %add4 = add nsw i32 %add, 128 %cmp = icmp ugt i32 %add4, 255 br i1 %cmp, label %if.then, label %if.end ; CHECK: llvm.sadd.with.overflow.i8 if.then: ; preds = %entry tail call void @throwAnExceptionOrWhatever() nounwind unreachable if.end: ; preds = %entry %conv7 = trunc i32 %add to i8 ret i8 %conv7 ; CHECK: ret i8 } ; CHECK: @test5 ; CHECK: llvm.uadd.with.overflow ; CHECK: ret i64 define i64 @test5(i64 %a, i64 %b) nounwind ssp { entry: %add = add i64 %b, %a %cmp = icmp ult i64 %add, %a %Q = select i1 %cmp, i64 %b, i64 42 ret i64 %Q } ; CHECK: @test6 ; CHECK: llvm.uadd.with.overflow ; CHECK: ret i64 define i64 @test6(i64 %a, i64 %b) nounwind ssp { entry: %add = add i64 %b, %a %cmp = icmp ult i64 %add, %b %Q = select i1 %cmp, i64 %b, i64 42 ret i64 %Q } ; CHECK: @test7 ; CHECK: llvm.uadd.with.overflow ; CHECK: ret i64 define i64 @test7(i64 %a, i64 %b) nounwind ssp { entry: %add = add i64 %b, %a %cmp = icmp ugt i64 %b, %add %Q = select i1 %cmp, i64 %b, i64 42 ret i64 %Q } ; CHECK: @test8 ; PR11438 ; This is @test1, but the operands are not sign-extended. Make sure ; we don't transform this case. define i32 @test8(i64 %a, i64 %b) nounwind ssp { entry: ; CHECK-NOT: llvm.sadd ; CHECK: add i64 %a, %b ; CHECK-NOT: llvm.sadd ; CHECK: ret %add = add i64 %a, %b %add.off = add i64 %add, 2147483648 %0 = icmp ugt i64 %add.off, 4294967295 br i1 %0, label %if.then, label %if.end if.then: tail call void @throwAnExceptionOrWhatever() nounwind br label %if.end if.end: %conv9 = trunc i64 %add to i32 ret i32 %conv9 }