derek.holloway
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67 lines
3.1 KiB
ArmAsm
67 lines
3.1 KiB
ArmAsm
// Test multiple K=128 WMMAs in a single kernel. The splitter accumulates
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// trampolines into Ctx.OutTrampolines and computes each new trampoline's
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// `.text` offset by walking the previously appended trampolines (the
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// TrampTextOffset accumulation pattern in applyWmmaSplitPatches). A bug in
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// that accumulation would land the s_branch-back from trampoline N at the
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// wrong target -- typically jumping into the next trampoline's body or off
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// the end of .text. Putting two WMMAs in one kernel and asserting both
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// landing pads carry the expected K=64 mnemonics is the smallest input that
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// exercises the >1-trampoline path.
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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 \
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// RUN: | %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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.amdgcn_target "amdgcn-amd-amdhsa--gfx1250"
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// COM: Both source K=128 mnemonics gone from the kernel body, replaced by
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// COM: two distinct s_branch instructions (one per trampoline).
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// DISASM-LABEL: <kernel>:
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// DISASM-NOT: v_wmma_f32_16x16x128_fp8_fp8
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// DISASM-NOT: v_wmma_f32_16x16x128_bf8_bf8
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// DISASM: s_branch
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// DISASM: s_branch
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// DISASM: s_endpgm
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// COM: Both trampolines appear after the kernel body, in source order. The
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// COM: K=64 fp8_fp8 trampoline is emitted first (its source WMMA appears
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// COM: first in the kernel), the K=64 bf8_bf8 trampoline second. Each
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// COM: trampoline is two K=64 halves followed by an s_branch back to the
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// COM: instruction after its source WMMA -- the accumulating
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// COM: TrampTextOffset means the second trampoline's branch target is
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// COM: computed relative to a position that already accounts for the
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// COM: first trampoline's bytes. Asserting the mnemonics in trampoline
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// COM: order (DISASM, not DISASM-DAG) catches a swap or a missing
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// COM: trampoline that DAG would mask.
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// DISASM: v_wmma_f32_16x16x64_fp8_fp8 v[32:39], v[0:7], v[16:23], v[32:39]
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// DISASM-NEXT: v_wmma_f32_16x16x64_fp8_fp8 v[32:39], v[8:15], v[24:31], v[32:39]
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// DISASM-NEXT: s_branch
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// DISASM: v_wmma_f32_16x16x64_bf8_bf8 v[40:47], v[0:7], v[16:23], v[40:47]
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// DISASM-NEXT: v_wmma_f32_16x16x64_bf8_bf8 v[40:47], v[8:15], v[24:31], v[40:47]
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// DISASM-NEXT: s_branch
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.globl kernel
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.p2align 8
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.type kernel,@function
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kernel:
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v_wmma_f32_16x16x128_fp8_fp8 v[32:39], v[0:15], v[16:31], v[32:39]
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v_wmma_f32_16x16x128_bf8_bf8 v[40:47], v[0:15], v[16:31], v[40:47]
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s_endpgm
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.size kernel, .-kernel
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// Idempotency: rewriting the patched output again should produce identical
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// bytes (same invariant as the omnibus test, asserted here for the
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// >1-trampoline path so a regression specific to the second trampoline
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// would surface).
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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: --output %t.out2.elf \
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// RUN: | %FileCheck --check-prefix=API2 %s
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// API2: RESULT: SUCCESS
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// RUN: cmp %t.out.elf %t.out2.elf
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