| ; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s |
| |
| ; The test case is rather involved, because we need to get to a state where |
| ; We have a sext(setcc x, y, cc) -> (select (setcc x, y, cc), T, 0) combine, |
| ; BUT this combine is only triggered post-legalization, so the setcc's return |
| ; type is i8. So we can't have the combine opportunity be exposed too early. |
| ; Basically, what we want to see is that the compare result zero-extended, and |
| ; then stored. Only one zext, and no sexts. |
| |
| ; CHECK-LABEL: main: |
| ; CHECK: movzbl (%rdi), %[[EAX:.*]] |
| ; CHECK-NEXT: xorl %e[[C:.]]x, %e[[C]]x |
| ; CHECK-NEXT: cmpl $1, %[[EAX]] |
| ; CHECK-NEXT: sete %[[C]]l |
| ; CHECK-NEXT: movl %e[[C]]x, (%rsi) |
| define void @main(i8* %p, i32* %q) { |
| bb: |
| %tmp4 = load i8, i8* %p, align 1 |
| %tmp5 = sext i8 %tmp4 to i32 |
| %tmp6 = load i8, i8* %p, align 1 |
| %tmp7 = zext i8 %tmp6 to i32 |
| %tmp8 = sub nsw i32 %tmp5, %tmp7 |
| %tmp11 = icmp eq i32 %tmp7, 1 |
| %tmp12 = zext i1 %tmp11 to i32 |
| %tmp13 = add nsw i32 %tmp8, %tmp12 |
| %tmp14 = trunc i32 %tmp13 to i8 |
| %tmp15 = sext i8 %tmp14 to i16 |
| %tmp16 = sext i16 %tmp15 to i32 |
| store i32 %tmp16, i32* %q, align 4 |
| br i1 %tmp11, label %bb21, label %bb22 |
| |
| bb21: ; preds = %bb |
| unreachable |
| |
| bb22: ; preds = %bb |
| ret void |
| } |
