derek.holloway
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55 lines
2.3 KiB
ArmAsm
55 lines
2.3 KiB
ArmAsm
// Test K-split with src2 == dst (the C += A*B accumulator-reuse pattern,
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// the most common WMMA shape in real kernels).
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//
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// At the source level, vdst and src2 share the same VGPR range. The
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// splitter's K-split second half uses dst as src2 (the carry from the
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// first half) regardless of the input's src2 -- which means for this
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// shape the second half's src2 is identical to what the source already
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// had, but the splitter still has to emit it correctly via the
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// transformation rather than blindly reusing the printed src2.
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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: Source: original K=128 opcode replaced by s_branch into 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: s_branch
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// DISASM: s_endpgm
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// COM: Trampoline: K=64 first half uses (A_lo, B_lo, original_src2 == dst);
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// COM: K=64 second half uses (A_hi, B_hi, dst as carry). Both halves
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// COM: write back to dst v[32:39], so on this shape the visible operand
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// COM: list is identical between halves -- only the sliced A/B differ.
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// COM: The two halves are emitted back-to-back in the trampoline body
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// COM: with the s_branch-back appended once at the end.
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// COM: Operand-shape note: src0/src1 are picked disjoint from dst per the
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// COM: source pseudo's @earlyclobber $vdst contract (VOP3PInstructions.td:1444).
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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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.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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s_endpgm
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.size kernel, .-kernel
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// Idempotency.
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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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