Add mem_rip_label(label_id) so a RIP-relative memory operand can
reference a label: the encoder writes a placeholder disp32 and emits a
REL32 relocation (addend 0) at the field's byte offset, mirroring the
existing .RELATIVE jump/call path. This expresses lea reg, [rip + <label>]
(position-independent data addressing).
Add op_imm_label(label_id) for movabs reg, <label>: the imm stays kind
.IMMEDIATE (form matching unchanged) but is flagged so the encoder emits
an ABS64 relocation for the imm64 instead of a literal; imm_matches_inline
forces the full IMM64 form so a small id can't collapse to mov r64, imm32.
Both labeled forms bypass the contextless recipe fast-path (which cannot
append relocations) and fall back to the interpreter. Flags reuse spare
bits in Memory (disp_is_label) and Operand_Flags (imm_is_label) -- no
struct growth. Section 11 tests cover resolved/unresolved disp, the ABS64
movabs, and an end-to-end executed lea+load.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Move all ten ISA packages (x86, arm32, arm64, mips, riscv, ppc, ppc_vle,
rsp, mos6502, mos65816) from core/rexcode/<arch> to core/rexcode/isa/<arch>,
so the import pattern is now `import "core:rexcode/isa/x86"`. The shared
core stays at core:rexcode/isa.
Mechanical: relative `import "../isa"` / "../../isa" -> absolute
"core:rexcode/isa" (the only path that survives the move; the "../" and
"../.." self/generated imports move with their packages). build.lua now
builds paths as <root>/isa/<name>; stale `cd <arch>` hints in the verify
tools and the doc.odin paths updated.
WASM stays at core/rexcode/wasm for now -- it is an IR, not an ISA, and
will move under the forthcoming core:rexcode/ir once that layer lands.
All 10 arches gen/builders/check/test green; import core:rexcode/isa/x86
verified working; wasm still compiles.
