SHA1RNDS4, SHA1NEXTE, SHA1MSG1 and SHA1MSG2 passed through --to-intel
unchanged, so a relinked title that executes them faults on Intel CPUs
without SHA-NI. Their register forms are now lowered out of line with
SSE2 only through the shared stub builder; short sites share stubs via
MatchSequence. Memory forms fail the relink with the file offset, as for
SHA-256.
Co-Authored-By: Claude <noreply@anthropic.com>
In 64-bit mode a REX prefix only takes effect when it immediately
precedes the opcode; a REX followed by a legacy prefix or another REX is
ignored. The instruction decoder, the rewriter's reference classifier,
DecodedInstruction and the SSE4a, SHA-256 and CLZERO operand decoders
read legacy prefixes and then at most one REX. `48 F3 0F 2B 00`
(MOVNTSS) was therefore scanned as `[48 F3][0F 2B 00]` and kept, and
`48 67 0F 01 FC` lost its address-size prefix.
All of them now accept REX bytes among the prefixes and keep only one
that directly precedes the opcode. The converter's guard against
prefix-only fragments is removed, since the decoder no longer produces
them, and the TechnicalDebt entry describing the split is dropped.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Lower SHA256RNDS2, SHA256MSG1 and SHA256MSG2 (register forms) out of line
with legacy SSE2 instructions only, so relinked code no longer needs
SHA-NI. Consecutive short SHA-256 and SSE4a sites share one stub. The
SSE4a stub builder moves to StubBodyBuilder for reuse; IsShaNi now also
recognises SHA256RNDS2 (0F 38 CB). Memory operand forms fail the relink.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
EXTRQ, INSERTQ, MOVNTSS and MOVNTSD are rewritten at relink time: same-length in-place forms
where they exist, otherwise a jmp rel32 into an appended executable section holding a
scratch-free SSE body and a jump back, so no code shifts and no RIP-relative or jump-table
operand needs adjusting. Decoder fixes for POPCNT and 0F BB (BTC), codegen and elfpatcher
tests, README and technical-debt notes. The runtime illegal-instruction trap stays as a
fallback.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0177gthrWEBBfBu5xJDXgBfo
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