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 29
