a7ee179577
Writing a Vector lane (`v.x = …`, `.y/.z/.w` + colour aliases) panicked with "unresolved type reached LLVM emission". The store path had no vector branch: a `.field_access` target on a Vector fell through to struct-field lookup, matched nothing, left `field_ty = .unresolved`, and built a `ptrTo(.unresolved)` that tripped the LLVM emission guard. The read path resolved the lane fine — the two had diverged (issue-0083 two-resolver class). Extract a shared `Lowering.vectorLaneIndex` resolver and route BOTH paths through it. The read path (`lowerFieldAccessOnType`) delegates to it, dropping its silent `else 0` fallback. A new vector branch in `lowerAssignment` GEPs a typed pointer to the lane (`structGepTyped`) and stores via `storeOrCompound` (plain + compound). `emitStructGep` now addresses a vector base type with a `[0, lane]` GEP. A non-lane field now reports field-not-found on both paths instead of silent-lane-0 / panic. Regression: examples/1506-vectors-lane-store.sx (panicked pre-fix, now reads back written values) + a vectorLaneIndex unit test. Resolves issue 0086; spec documents element assignment.
47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
// Writing a `Vector` lane — `v.x = …` (and `.y`/`.z`/`.w`, plus the colour
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// aliases `.r`/`.g`/`.b`/`.a`) — stores through a pointer to that lane and
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// reads back the written value. Covers a `.[…]`-init write, a `= ---`
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// (undefined) init write, writes to every lane of a 4-lane vector, the colour
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// aliases, and a compound lane assignment (`+= / *=`).
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//
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// Regression (issue 0086): the lane STORE path fell through to struct-field
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// lookup, where no field matched a vector lane, leaving the lane pointer's
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// pointee as the `.unresolved` sentinel — which panicked at LLVM emission
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// ("unresolved type reached LLVM emission"). The store path now resolves the
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// lane index via the same shared `vectorLaneIndex` resolver the read path uses
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// and GEPs a typed pointer to the lane, so the two paths never diverge.
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#import "modules/std.sx";
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main :: () {
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// `.[…]`-init, then write each lane of a 4-lane vector.
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v : Vector(4, f32) = .[0.0, 0.0, 0.0, 0.0];
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v.x = 1.0;
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v.y = 2.0;
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v.z = 3.0;
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v.w = 4.0;
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print("x={}\n", v.x);
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print("y={}\n", v.y);
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print("z={}\n", v.z);
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print("w={}\n", v.w);
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// `= ---` (undefined) init, then write every lane.
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u : Vector(4, f32) = ---;
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u.x = 10.0;
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u.y = 20.0;
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u.z = 30.0;
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u.w = 40.0;
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print("u={} {} {} {}\n", u.x, u.y, u.z, u.w);
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// Colour aliases on a 3-lane vector.
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col : Vector(3, f32) = .[0.0, 0.0, 0.0];
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col.r = 0.5;
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col.g = 0.25;
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col.b = 0.125;
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print("col={} {} {}\n", col.r, col.g, col.b);
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// Compound lane assignment.
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col.r += 0.5;
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col.g *= 4.0;
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print("col2={} {}\n", col.r, col.g);
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}
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