derek.holloway
7502bf64a4
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19 lines
958 B
ArmAsm
19 lines
958 B
ArmAsm
// Source for the B0->B0 entry-trampoline fast-path stub body. Assembled by
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// gen-hotswap-fast-stub-inc.sh into comgr-hotswap-entry-trampoline-fast-stub.inc.
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//
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// The body is 40 bytes: the `global_prefetch_b8 v0, s[0:1] scope:SCOPE_SE;
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// v_nop` unclaused-VMEM workaround prefix (ROCm/llvm-project#3483), then an
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// s_get_pc / s_add64 / s_set_pc PC-relative redirect. The scratch pair is
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// spelled s[100:101]; the runtime rewrites the six SGPR register-field bytes
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// per kernel to the allocated pair (see comgr-hotswap-internal.h FastEntry*).
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//
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// The two s_add immediates use a non-zero literal so the assembler emits the
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// 32-bit-literal encoding (imm=0 would use the shorter inline-constant form);
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// the generator zeroes those dword slots, and the runtime writes the delta.
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global_prefetch_b8 v0, s[0:1] scope:SCOPE_SE
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v_nop
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s_get_pc_i64 s[100:101]
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s_add_co_u32 s100, s100, 0xdeadbeef
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s_add_co_ci_u32 s101, s101, 0xdeadbeef
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s_set_pc_i64 s[100:101]
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