1# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py 2# RUN: llc -march=amdgcn -o - -run-pass=block-placement -mcpu=gfx1010 -mattr=-inst-fwd-prefetch-bug -verify-machineinstrs %s | FileCheck -check-prefix=GCN %s 3 4# Used to fail with 5# Assertion `Out && "Header of loop has no predecessors from outside loop?" 6 7--- 8name: loop_header_nopred 9body: | 10 ; GCN-LABEL: name: loop_header_nopred 11 ; GCN: bb.0: 12 ; GCN: successors: %bb.2(0x80000000) 13 ; GCN: S_BRANCH %bb.2 14 ; GCN: bb.1 (align 64): 15 ; GCN: successors: %bb.7(0x04000000), %bb.2(0x7c000000) 16 ; GCN: S_CBRANCH_VCCNZ %bb.7, implicit $vcc_lo 17 ; GCN: bb.2: 18 ; GCN: successors: %bb.5(0x40000000), %bb.1(0x40000000) 19 ; GCN: S_CBRANCH_EXECZ %bb.1, implicit $exec 20 ; GCN: bb.5: 21 ; GCN: successors: %bb.1(0x04000000), %bb.5(0x7c000000) 22 ; GCN: S_NOP 0 23 ; GCN: S_NOP 0 24 ; GCN: S_NOP 0 25 ; GCN: S_NOP 0 26 ; GCN: S_NOP 0 27 ; GCN: S_NOP 0 28 ; GCN: S_NOP 0 29 ; GCN: S_NOP 0 30 ; GCN: S_NOP 0 31 ; GCN: S_NOP 0 32 ; GCN: S_NOP 0 33 ; GCN: S_CBRANCH_EXECZ %bb.5, implicit $exec 34 ; GCN: S_BRANCH %bb.1 35 ; GCN: bb.7: 36 ; GCN: S_ENDPGM 0 37 bb.0: 38 successors: %bb.1(0x80000000) 39 40 bb.1: 41 successors: %bb.2(0x40000000), %bb.3(0x40000000) 42 43 S_CBRANCH_VCCZ %bb.3, implicit $vcc 44 S_BRANCH %bb.2 45 46 bb.2: 47 successors: %bb.3(0x80000000) 48 49 bb.3: 50 successors: %bb.4(0x40000000), %bb.6(0x40000000) 51 52 S_CBRANCH_EXECZ %bb.6, implicit $exec 53 S_BRANCH %bb.4 54 55 bb.4: 56 successors: %bb.5(0x04000000), %bb.4(0x7c000000) 57 58 S_NOP 0 59 S_NOP 0 60 S_NOP 0 61 S_NOP 0 62 S_NOP 0 63 S_NOP 0 64 S_NOP 0 65 S_NOP 0 66 S_NOP 0 67 S_NOP 0 68 S_NOP 0 69 S_CBRANCH_EXECZ %bb.4, implicit $exec 70 71 bb.5: 72 successors: %bb.6(0x80000000) 73 74 bb.6: 75 successors: %bb.7(0x04000000), %bb.1(0x7c000000) 76 77 S_CBRANCH_VCCZ %bb.1, implicit $vcc 78 79 bb.7: 80 S_ENDPGM 0 81... 82