--- /dev/null
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -march=amdgcn -o - -run-pass=block-placement -mcpu=gfx1010 -mattr=-inst-fwd-prefetch-bug -verify-machineinstrs %s | FileCheck -check-prefix=GCN %s
+
+# Used to fail with
+# Assertion `Out && "Header of loop has no predecessors from outside loop?"
+
+---
+name: loop_header_nopred
+body: |
+ ; GCN-LABEL: name: loop_header_nopred
+ ; GCN: bb.0:
+ ; GCN: successors: %bb.2(0x40000000), %bb.3(0x40000000)
+ ; GCN: S_CBRANCH_VCCZ %bb.3, implicit $vcc
+ ; GCN: S_BRANCH %bb.2
+ ; GCN: bb.6 (align 64):
+ ; GCN: successors: %bb.7(0x04000000), %bb.1(0x7c000000)
+ ; GCN: S_CBRANCH_VCCNZ %bb.7, implicit $vcc
+ ; GCN: bb.1:
+ ; GCN: successors: %bb.2(0x40000000), %bb.3(0x40000000)
+ ; GCN: S_CBRANCH_VCCNZ %bb.2, implicit $vcc
+ ; GCN: bb.3:
+ ; GCN: successors: %bb.4(0x40000000), %bb.6(0x40000000)
+ ; GCN: SI_MASK_BRANCH %bb.6, implicit $exec
+ ; GCN: S_BRANCH %bb.4
+ ; GCN: bb.2 (align 64):
+ ; GCN: successors: %bb.4(0x40000000), %bb.6(0x40000000)
+ ; GCN: SI_MASK_BRANCH %bb.6, implicit $exec
+ ; GCN: S_BRANCH %bb.4
+ ; GCN: bb.4:
+ ; GCN: successors: %bb.5(0x04000000), %bb.4(0x7c000000)
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_NOP 0
+ ; GCN: S_CBRANCH_EXECZ %bb.4, implicit $exec
+ ; GCN: bb.5:
+ ; GCN: successors: %bb.6(0x80000000)
+ ; GCN: S_BRANCH %bb.6
+ ; GCN: bb.7:
+ ; GCN: S_ENDPGM 0
+ bb.0:
+ successors: %bb.1(0x80000000)
+
+ bb.1:
+ successors: %bb.2(0x40000000), %bb.3(0x40000000)
+
+ S_CBRANCH_VCCZ %bb.3, implicit $vcc
+ S_BRANCH %bb.2
+
+ bb.2:
+ successors: %bb.3(0x80000000)
+
+ bb.3:
+ successors: %bb.4(0x40000000), %bb.6(0x40000000)
+
+ SI_MASK_BRANCH %bb.6, implicit $exec
+ S_BRANCH %bb.4
+
+ bb.4:
+ successors: %bb.5(0x04000000), %bb.4(0x7c000000)
+
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_NOP 0
+ S_CBRANCH_EXECZ %bb.4, implicit $exec
+
+ bb.5:
+ successors: %bb.6(0x80000000)
+
+ bb.6:
+ successors: %bb.7(0x04000000), %bb.1(0x7c000000)
+
+ S_CBRANCH_VCCZ %bb.1, implicit $vcc
+
+ bb.7:
+ S_ENDPGM 0
+...