d3c6ffed5a
Replaces the N>1 "Phase E" bail with a shared asmResultType helper (lowering +
inferType) that derives the result type from the out_value operands: 0→void,
1→T, N→a named tuple (fields named via the §II.5 effective-name rule).
Key realization: toLLVMType(tuple) already produces a literal struct {T1,…,Tn} —
exactly what LLVM's multi-output inline asm returns — so emit needs NO change.
Building the op with a tuple result type makes the asm call return the struct,
which IS sx's tuple value (destructured by the normal tuple_get path).
inferType's .asm_expr arm now also delegates to asmResultType (single owner), so
`return asm`, `x := asm`, and `q, r := asm` all agree on the type.
Verified end-to-end on aarch64: split(0x1234)→(lo=52,hi=18), a udiv/msub
divmod→(3,2). IR: `call { i64, i64 } asm "divq ${4}",
"={rax},={rdx},{rax},{rdx},r,~{cc}"(…)` → extractvalue → tuple.
1640 → the x86_64 multi-output IR lock (ir-only); 1647 → a multi-output example
that runs on aarch64.
zig build test green (655 corpus, 446 unit).
21 lines
806 B
Plaintext
21 lines
806 B
Plaintext
// ASM stream Phase E — x86_64 multi-output asm: `divq` produces quotient in rax
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// and remainder in rdx, returned as a `(quot, rem)` tuple. Two `={rax}`/`={rdx}`
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// value outputs ⇒ LLVM returns a `{ i64, i64 }` struct, which IS sx's tuple
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// representation (so `q, r := …` destructures it directly). x86-pinned via
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// `.build`: ir-only on a non-x86 host (the `.ir` snapshot locks the struct
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// return + `%[name]` rewrite); runs natively on x86_64-linux. See 1647 for a
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// multi-output example that executes on aarch64.
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divmod :: (n: u64, d: u64) -> (quot: u64, rem: u64) {
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return asm {
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"divq %[d]",
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[quot] "={rax}" -> u64,
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[rem] "={rdx}" -> u64,
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"{rax}" = n, "{rdx}" = 0, [d] "r" = d,
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clobbers(.cc),
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};
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}
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main :: () {
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q, r := divmod(17, 5);
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}
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