derek.holloway
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76 lines
3.1 KiB
ArmAsm
76 lines
3.1 KiB
ArmAsm
// COM: Splitting a compound DS instruction must preserve its read-before-write
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// COM: semantics when the address or data registers overlap a destination.
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// COM: This kernel deliberately has no nop sled, forcing the appended
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// COM: trampoline/growth path. Its cyclic exchange is the intentional no-op
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// COM: case: the original instruction must remain byte-stable.
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib %s -o %t.elf
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// RUN: hotswap-rewrite %t.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --output %t.out.elf | %FileCheck --check-prefix=API %s
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// API: RESULT: SUCCESS
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// RUN: %llvm-objdump -d %t.out.elf | %FileCheck --check-prefix=DISASM %s
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// RUN: hotswap-rewrite %t.out.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --check-idempotent | %FileCheck --check-prefix=IDEM %s
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// IDEM: IDEMPOTENT: YES
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// DISASM-LABEL: <test_ds_overlap>:
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// COM: Address overlaps the first b64 destination half: issue half 1 first.
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// DISASM: ds_load_b64 v[14:15], v12 offset:8
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// DISASM-NEXT: ds_load_b64 v[12:13], v12
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// COM: The same rule applies to b32.
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// DISASM: ds_load_b32 v5, v4 offset:8
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// DISASM-NEXT: ds_load_b32 v4, v4 offset:4
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// COM: Address overlaps the second half: natural order is already safe.
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// DISASM: ds_load_b64 v[16:17], v18
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// DISASM-NEXT: ds_load_b64 v[18:19], v18 offset:8
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// COM: Exchange op0 would clobber op1's address, so reverse the operations.
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// DISASM: ds_storexchg_rtn_b64 v[10:11], v8, v[14:15] offset:8
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// DISASM-NEXT: ds_storexchg_rtn_b64 v[8:9], v8, v[12:13]
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// COM: A data1 dependency also reverses a b32 exchange.
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// DISASM: ds_storexchg_rtn_b32 v31, v40, v30 offset:4
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// DISASM-NEXT: ds_storexchg_rtn_b32 v30, v40, v41
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// COM: A data0 dependency on destination half 1 keeps the natural order.
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// DISASM: ds_storexchg_rtn_b32 v32, v40, v33
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// DISASM-NEXT: ds_storexchg_rtn_b32 v33, v40, v41 offset:4
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// COM: Stride64 loads and exchanges use the same dependency ordering while
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// COM: scaling offset1 by 64 elements.
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// DISASM: ds_load_b64 v[44:45], v42 offset:512
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// DISASM-NEXT: ds_load_b64 v[42:43], v42
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// DISASM: ds_storexchg_rtn_b64 v[48:49], v46, v[52:53] offset:512
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// DISASM-NEXT: ds_storexchg_rtn_b64 v[46:47], v46, v[50:51]
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.amdgcn_target "amdgcn-amd-amdhsa--gfx1250"
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.text
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.globl test_ds_overlap
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.p2align 8
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.type test_ds_overlap,@function
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test_ds_overlap:
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ds_load_2addr_b64 v[12:15], v12 offset0:0 offset1:1
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ds_load_2addr_b32 v[4:5], v4 offset0:1 offset1:2
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ds_load_2addr_b64 v[16:19], v18 offset0:0 offset1:1
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ds_storexchg_2addr_rtn_b64 v[8:11], v8, v[12:13], v[14:15] offset0:0 offset1:1
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ds_storexchg_2addr_rtn_b32 v[30:31], v40, v41, v30 offset0:0 offset1:1
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ds_storexchg_2addr_rtn_b32 v[32:33], v40, v33, v41 offset0:0 offset1:1
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ds_load_2addr_stride64_b64 v[42:45], v42 offset0:0 offset1:1
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ds_storexchg_2addr_stride64_rtn_b64 v[46:49], v46, v[50:51], v[52:53] offset0:0 offset1:1
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s_wait_dscnt 0x0
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s_endpgm
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.Ltest_ds_overlap_end:
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.size test_ds_overlap, .Ltest_ds_overlap_end-test_ds_overlap
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.rodata
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.p2align 8
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.amdhsa_kernel test_ds_overlap
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.amdhsa_next_free_vgpr 54
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.amdhsa_next_free_sgpr 2
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.end_amdhsa_kernel
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