derek.holloway
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75 lines
2.6 KiB
YAML
75 lines
2.6 KiB
YAML
# RUN: llc -mtriple=amdgcn -mcpu=gfx950 -start-before=block-placement -o - %s | FileCheck %s
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# Test that loop headers are aligned to 32 bytes on GFX950 when the first
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# instruction is 8 bytes, to prevent the instruction from being split by the
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# 32-byte fetch window boundary.
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# The second test case verifies that 4-byte instructions do NOT trigger
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# alignment (CHECK-NEXT chain would break if .p2align were inserted).
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---
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name: loop_with_8byte_first_inst
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tracksRegLiveness: true
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body: |
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; CHECK-LABEL: loop_with_8byte_first_inst:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: s_mov_b64 s[0:1], 0
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; CHECK-NEXT: .p2align 5, , 4
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; CHECK-NEXT: .LBB0_1: ; =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: v_lshrrev_b64 v[0:1], 1, v[0:1]
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bb.0:
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successors: %bb.1(0x80000000)
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liveins: $vgpr0_vgpr1
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renamable $sgpr0_sgpr1 = S_MOV_B64 0
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bb.1:
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successors: %bb.2(0x04000000), %bb.1(0x7c000000)
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liveins: $sgpr0_sgpr1, $vgpr0_vgpr1
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renamable $vgpr0_vgpr1 = V_LSHRREV_B64_e64 1, killed renamable $vgpr0_vgpr1, implicit $exec
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V_CMP_EQ_U64_e32 0, $vgpr0_vgpr1, implicit-def $vcc, implicit $exec
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renamable $sgpr0_sgpr1 = S_OR_B64 killed renamable $vcc, killed renamable $sgpr0_sgpr1, implicit-def $scc
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$exec = S_ANDN2_B64 $exec, renamable $sgpr0_sgpr1, implicit-def $scc
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S_CBRANCH_EXECNZ %bb.1, implicit $exec
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bb.2:
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liveins: $sgpr0_sgpr1
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$exec = S_OR_B64 $exec, killed renamable $sgpr0_sgpr1, implicit-def $scc
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S_SETPC_B64_return undef $sgpr30_sgpr31
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...
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---
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name: loop_with_4byte_first_inst
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tracksRegLiveness: true
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body: |
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; CHECK-LABEL: loop_with_4byte_first_inst:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: s_mov_b64 s[0:1], 0
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; CHECK-NEXT: .LBB1_1: ; =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: v_add_u32_e32 v0, 1, v0
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bb.0:
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successors: %bb.1(0x80000000)
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liveins: $vgpr0
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renamable $sgpr0_sgpr1 = S_MOV_B64 0
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bb.1:
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successors: %bb.2(0x04000000), %bb.1(0x7c000000)
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liveins: $sgpr0_sgpr1, $vgpr0
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renamable $vgpr0 = V_ADD_U32_e32 1, killed $vgpr0, implicit $exec
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V_CMP_LT_U32_e32 10, $vgpr0, implicit-def $vcc, implicit $exec
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renamable $sgpr0_sgpr1 = S_OR_B64 killed renamable $vcc, killed renamable $sgpr0_sgpr1, implicit-def $scc
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$exec = S_ANDN2_B64 $exec, renamable $sgpr0_sgpr1, implicit-def $scc
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S_CBRANCH_EXECNZ %bb.1, implicit $exec
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bb.2:
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liveins: $sgpr0_sgpr1
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$exec = S_OR_B64 $exec, killed renamable $sgpr0_sgpr1, implicit-def $scc
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S_SETPC_B64_return undef $sgpr30_sgpr31
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...
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