| Krzysztof Parzyszek | fdb7b69 | 2015-10-21 02:40:06 +0000 | [diff] [blame] | 1 | ; RUN: llc -march=hexagon -O2 -disable-cgp < %s |
| 2 | ; REQUIRES: asserts |
| 3 | ; |
| 4 | ; Tail duplication can ignore subregister information on PHI nodes, and as |
| 5 | ; a result, generate COPY instructions between registers of different classes. |
| 6 | ; This could lead to HexagonInstrInfo::copyPhysReg aborting on an unhandled |
| 7 | ; src/dst combination. |
| 8 | ; |
| 9 | define i32 @foo(i32 %x, i64 %y) nounwind { |
| 10 | entry: |
| 11 | %a = icmp slt i32 %x, 0 |
| 12 | %lo = trunc i64 %y to i32 |
| 13 | br i1 %a, label %next, label %tail |
| 14 | tail: |
| 15 | br label %join |
| 16 | next: |
| 17 | %c = icmp eq i32 %x, 0 |
| 18 | br i1 %c, label %b1, label %tail |
| 19 | b1: |
| 20 | %t1 = lshr i64 %y, 32 |
| 21 | %hi = trunc i64 %t1 to i32 |
| 22 | br label %join |
| 23 | join: |
| 24 | %val = phi i32 [ %hi, %b1 ], [ %lo, %tail ] |
| 25 | ret i32 %val |
| 26 | } |
| 27 | |
| 28 | |