derek.holloway
7502bf64a4
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384 lines
13 KiB
ArmAsm
384 lines
13 KiB
ArmAsm
// COM: Production activation kernels select one of several local callees with
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// COM: get-PC/carry materialization, merge the selected address, and reuse it
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// COM: across many register calls. Resolve the finite reaching-target set so
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// COM: an unrelated required far rewrite may safely use external gateway
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// COM: padding. A selector bypass would leave the target unknown and must
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// COM: continue to fail closed.
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib %s -o %t.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 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 2>&1 | %FileCheck --check-prefix=LOG %s
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// LOG: hotswap: resolved PC-materialized call
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// LOG: hotswap: resolved reusable PC-materialized call
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// LOG-SAME: to 1 target(s)
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// LOG: hotswap: resolved reusable PC-materialized call
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// LOG-SAME: to 2 target(s)
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// LOG-NOT: hotswap: unresolved call target
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// LOG: hotswap: planned 1 shared far-dispatch gateway group(s) for 8 source site(s)
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// LOG: RESULT: SUCCESS
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// RUN: sed 's/^\.set unsafe_selector, 0$/.set unsafe_selector, 1/' \
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// RUN: %s > %t.bypass.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.bypass.s -o %t.bypass.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.bypass.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=BYPASS,FAIL %s
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// BYPASS: hotswap: unresolved call target
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// OVERLAP: hotswap: unresolved call target
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// CLOBBER: hotswap: resolved reusable PC-materialized call
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// CLOBBER: hotswap: unresolved call target
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// BOOTSTRAP-CLOBBER: hotswap: resolved PC-materialized call
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// BOOTSTRAP-CLOBBER: hotswap: unresolved call target
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// TAIL: hotswap: resolved reusable PC-materialized call
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// TAIL: hotswap: unresolved call target
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// INDIRECT: hotswap: resolved reusable PC-materialized call
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// INDIRECT: hotswap: unresolved call target
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// EXTERNAL: hotswap: unresolved call target
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// UNDECODED: hotswap: resolved reusable PC-materialized call
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// UNDECODED: hotswap: unresolved call target
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// RECONVERGE: hotswap: resolved reusable PC-materialized call
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// RECONVERGE: hotswap: unresolved call target
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// FAIL: hotswap: unresolved control-flow target disables NOP-sled emission,
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// FAIL-SAME: trampoline coalescing, source relocation, and .text gateways
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// FAIL: hotswap: error: no safe short-branch gateway for far site
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// FAIL: RESULT: ERROR
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// RUN: sed 's/^\.set overlap_delta, 0$/.set overlap_delta, 1/' \
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// RUN: %s > %t.overlap.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.overlap.s -o %t.overlap.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.overlap.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=OVERLAP,FAIL %s
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// RUN: sed 's/^\.set clobber_target, 0$/.set clobber_target, 1/' \
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// RUN: %s > %t.clobber.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.clobber.s -o %t.clobber.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.clobber.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=CLOBBER,FAIL %s
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// RUN: sed 's/^\.set clobber_bootstrap, 0$/.set clobber_bootstrap, 1/' \
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// RUN: %s > %t.bootstrap-clobber.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.bootstrap-clobber.s -o %t.bootstrap-clobber.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite \
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// RUN: %t.bootstrap-clobber.elf amdgcn-amd-amdhsa--gfx1250 \
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// RUN: amdgcn-amd-amdhsa--gfx1250 --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=BOOTSTRAP-CLOBBER,FAIL %s
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// RUN: sed 's/^\.set tail_escape, 0$/.set tail_escape, 1/' \
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// RUN: %s > %t.tail.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.tail.s -o %t.tail.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.tail.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=TAIL,FAIL %s
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// RUN: sed 's/^\.set indirect_escape, 0$/.set indirect_escape, 1/' \
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// RUN: %s > %t.indirect.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.indirect.s -o %t.indirect.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.indirect.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=INDIRECT,FAIL %s
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// RUN: sed 's/^\.set external_entry, 0$/.set external_entry, 1/' \
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// RUN: %s > %t.external.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.external.s -o %t.external.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.external.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=EXTERNAL,FAIL %s
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// RUN: sed 's/^\.set outside_selector, 0$/.set outside_selector, 1/' \
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// RUN: %s > %t.outside.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.outside.s -o %t.outside.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.outside.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefix=OUTSIDE %s
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// OUTSIDE: hotswap: resolved PC-materialized call
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// OUTSIDE: hotswap: resolved reusable PC-materialized call
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// OUTSIDE-SAME: to 1 target(s)
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// OUTSIDE: hotswap: resolved reusable PC-materialized call
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// OUTSIDE-SAME: to 3 target(s)
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// OUTSIDE: hotswap: unresolved call target
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// OUTSIDE-SAME: (s_swap_pc_i64)
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// OUTSIDE: hotswap: unresolved control-flow target disables NOP-sled emission,
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// OUTSIDE-SAME: trampoline coalescing, source relocation, and .text gateways
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// OUTSIDE: hotswap: error: no safe short-branch gateway for far site
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// OUTSIDE: RESULT: ERROR
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// An undecoded slot between the two reused calls must not let the later call
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// resolve: its bytes could clobber the target pair or divert control flow.
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// RUN: sed 's/^\.set undecoded_gap, 0$/.set undecoded_gap, 1/' \
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// RUN: %s > %t.undecoded.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.undecoded.s -o %t.undecoded.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.undecoded.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=UNDECODED,FAIL %s
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// A back-edge that reloads the target pair through an unprovable definition
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// makes the reconverged call Unknown; a stale finite result from the first
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// visit must not survive.
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// RUN: sed 's/^\.set reconverge_reload, 0$/.set reconverge_reload, 1/' \
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// RUN: %s > %t.reconverge.s
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// RUN: %clang -target amdgcn-amd-amdhsa -mcpu=gfx1250 -nostdlib \
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// RUN: %t.reconverge.s -o %t.reconverge.elf
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// RUN: env AMD_COMGR_EMIT_VERBOSE_LOGS=1 hotswap-rewrite %t.reconverge.elf \
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// RUN: amdgcn-amd-amdhsa--gfx1250 amdgcn-amd-amdhsa--gfx1250 \
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// RUN: --expect-status ERROR 2>&1 \
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// RUN: | %FileCheck --check-prefixes=RECONVERGE,FAIL %s
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// RUN: %llvm-objdump -d %t.out.elf | %FileCheck --check-prefix=DISASM \
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// RUN: --implicit-check-not=s_add_pc_i64 %s
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// DISASM-LABEL: <reusable_pc_targets>:
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// DISASM: s_swap_pc_i64 s[6:7]
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// DISASM-NEXT: s_swap_pc_i64 s[6:7]
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// DISASM-NEXT: s_branch
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// DISASM-NEXT: s_get_pc_i64
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// DISASM-NEXT: s_branch
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// DISASM-NEXT: s_branch
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// DISASM-NEXT: s_get_pc_i64
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// DISASM-NEXT: s_branch
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// DISASM-LABEL: <gateway_barrier>:
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// DISASM-NEXT: s_endpgm
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// DISASM-NEXT: s_get_pc_i64
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// DISASM-NEXT: s_add_nc_u64
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// DISASM-NEXT: s_set_pc_i64
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// DISASM: ds_load_b32 v0, v2 offset:256
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// DISASM-NEXT: ds_load_b32 v1, v2 offset:768
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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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.set unsafe_selector, 0
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.set outside_selector, 0
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.set overlap_delta, 0
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.set clobber_target, 0
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.set clobber_bootstrap, 0
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.set tail_escape, 0
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.set indirect_escape, 0
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.set external_entry, 0
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.set undecoded_gap, 0
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.set reconverge_reload, 0
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.amdgcn_target "amdgcn-amd-amdhsa--gfx1250"
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.text
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.if external_entry
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.type external_materialization_entry,@function
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external_materialization_entry:
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// This independent function enters after get-PC and delta creation.
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s_branch .Lfirst_add_low
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s_endpgm
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.size external_materialization_entry, .-external_materialization_entry
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.endif
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.local callee_bootstrap
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.type callee_bootstrap,@function
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callee_bootstrap:
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s_mov_b32 s8, 3
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.if clobber_bootstrap
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s_mov_b32 s10, 0
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.endif
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s_set_pc_i64 s[12:13]
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.size callee_bootstrap, .-callee_bootstrap
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.globl reusable_pc_targets
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.p2align 8
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.type reusable_pc_targets,@function
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reusable_pc_targets:
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// A straight-line first call is resolved by the one-shot matcher. Its
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// proven target remains reusable after the audited callee returns.
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.Lbootstrap_getpc:
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s_get_pc_i64 s[10:11]
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s_add_nc_u64 s[10:11], s[10:11], callee_bootstrap-(.Lbootstrap_getpc+4)
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s_swap_pc_i64 s[12:13], s[10:11]
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s_swap_pc_i64 s[12:13], s[10:11]
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.if unsafe_selector
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// This edge reaches the call without executing either get-PC sequence.
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s_cmp_eq_u32 s0, 2
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s_cbranch_scc1 .Lselected
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.endif
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.if outside_selector
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s_cmp_eq_u32 s0, 3
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s_cbranch_scc1 .Lselect_outside
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.endif
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s_cmp_eq_u32 s0, 0
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s_cbranch_scc1 .Lselect_second
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.Lselect_first:
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s_get_pc_i64 s[2:3]
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.if overlap_delta
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// The temporary aliases the PC pair and destroys its low half.
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s_add_co_i32 s2, callee_first-(.Lselect_first+4)-4, 4
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.Lfirst_add_low:
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s_add_co_u32 s2, s2, s2
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.else
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s_add_co_i32 s4, callee_first-(.Lselect_first+4)-4, 4
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.Lfirst_add_low:
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s_add_co_u32 s2, s2, s4
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.endif
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s_add_co_ci_u32 s3, s3, 0
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s_branch .Lselected
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.Lselect_second:
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s_get_pc_i64 s[2:3]
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.if overlap_delta
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s_add_co_i32 s2, callee_second-(.Lselect_second+4)-4, 4
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s_add_co_u32 s2, s2, s2
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.else
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s_add_co_i32 s4, callee_second-(.Lselect_second+4)-4, 4
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s_add_co_u32 s2, s2, s4
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.endif
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s_add_co_ci_u32 s3, s3, 0
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.if outside_selector
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s_branch .Lselected
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.Lselect_outside:
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s_get_pc_i64 s[2:3]
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s_add_co_i32 s4, outside_text_end-(.Lselect_outside+4)-4, 4
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s_add_co_u32 s2, s2, s4
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s_add_co_ci_u32 s3, s3, 0
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.endif
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.Lselected:
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s_swap_pc_i64 s[6:7], s[2:3]
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.if undecoded_gap
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// Keep the first call's return continuation decoded, then place an unknown
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// word before the second call. The solver must not carry the finite target
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// set across it.
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s_nop 0
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.long 0xffffffff
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.endif
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.if reconverge_reload
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// One path reaches the second reused call with the proven pair; a sibling
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// path reloads it through an unprovable definition. They reconverge on the
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// second call, which must therefore be Unknown -- not the finite result the
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// proven path alone recorded on its earlier visit.
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s_cmp_eq_u32 s0, 5
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s_cbranch_scc1 .Lreload_join
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s_branch .Lreused_second
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.Lreload_join:
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s_mov_b32 s2, 0
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s_mov_b32 s3, 0
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.Lreused_second:
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.endif
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// Production kernels reuse this selected pair for multiple calls.
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s_swap_pc_i64 s[6:7], s[2:3]
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s_branch .Lpatch0
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.Lpatch0:
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ds_load_2addr_stride64_b32 v[0:1], v2 offset0:1 offset1:3
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s_branch .Lpatch1
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.Lpatch1:
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ds_load_2addr_stride64_b32 v[0:1], v2 offset0:1 offset1:3
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s_branch .Lpatch2
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.Lpatch2:
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ds_load_2addr_stride64_b32 v[0:1], v2 offset0:1 offset1:3
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s_branch .Lpatch3
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.Lpatch3:
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ds_load_2addr_stride64_b32 v[0:1], v2 offset0:1 offset1:3
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s_branch .Lpatch4
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.Lpatch4:
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ds_load_2addr_stride64_b32 v[0:1], v2 offset0:1 offset1:3
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s_branch .Lpatch5
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.Lpatch5:
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ds_load_2addr_stride64_b32 v[0:1], v2 offset0:1 offset1:3
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s_branch .Lpatch6
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.Lpatch6:
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ds_load_2addr_stride64_b32 v[0:1], v2 offset0:1 offset1:3
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s_branch .Lpatch7
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.Lpatch7:
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ds_load_2addr_stride64_b32 v[0:1], v2 offset0:1 offset1:3
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.Lpatch_done:
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s_wait_dscnt 0x0
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s_endpgm
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.size reusable_pc_targets, .-reusable_pc_targets
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.local callee_first
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.type callee_first,@function
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callee_first:
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s_mov_b32 s8, 1
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.if clobber_target
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s_mov_b32 s2, 0
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.endif
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.if tail_escape
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s_branch clobber_helper
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.endif
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.if indirect_escape
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s_set_pc_i64 s[10:11]
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.endif
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s_set_pc_i64 s[6:7]
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.size callee_first, .-callee_first
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.local callee_second
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.type callee_second,@function
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callee_second:
|
|
s_mov_b32 s8, 2
|
|
.if clobber_target
|
|
s_mov_b32 s2, 0
|
|
.endif
|
|
.if tail_escape
|
|
s_branch clobber_helper
|
|
.endif
|
|
.if indirect_escape
|
|
s_set_pc_i64 s[10:11]
|
|
.endif
|
|
s_set_pc_i64 s[6:7]
|
|
.size callee_second, .-callee_second
|
|
|
|
.if tail_escape
|
|
.local clobber_helper
|
|
.type clobber_helper,@function
|
|
clobber_helper:
|
|
s_mov_b32 s2, 0
|
|
s_set_pc_i64 s[6:7]
|
|
.size clobber_helper, .-clobber_helper
|
|
.endif
|
|
|
|
.type gateway_barrier,@function
|
|
gateway_barrier:
|
|
s_endpgm
|
|
.size gateway_barrier, .-gateway_barrier
|
|
.fill 20, 1, 0
|
|
|
|
.rept 40000
|
|
s_mov_b32 s10, s11
|
|
.endr
|
|
|
|
outside_text_end:
|
|
.rodata
|
|
.p2align 8
|
|
.amdhsa_kernel reusable_pc_targets
|
|
.amdhsa_next_free_vgpr 3
|
|
.amdhsa_next_free_sgpr 14
|
|
.end_amdhsa_kernel
|
|
|
|
.amdgpu_metadata
|
|
amdhsa.version:
|
|
- 3
|
|
- 0
|
|
amdhsa.kernels:
|
|
- .name: reusable_pc_targets
|
|
.symbol: reusable_pc_targets.kd
|
|
.sgpr_count: 14
|
|
.vgpr_count: 3
|
|
.kernarg_segment_size: 0
|
|
.group_segment_fixed_size: 0
|
|
.private_segment_fixed_size: 0
|
|
.kernarg_segment_align: 8
|
|
.wavefront_size: 64
|
|
.max_flat_workgroup_size: 256
|
|
.end_amdgpu_metadata
|