FA-11489 / Compiler transformation correctness / Member archive

Instruction swapping ignores a write after an earlier read · case 04

Instruction swapping ignores a write after an earlier read.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Return whether two adjacent pure register instructions can swap; each read/write collection is a set of register names, and any RAW, WAR or WAW conflict forbids swapping. Memory and control effects are excluded.

Why this case matters

A deterministic miniature compiler-pass model; inputs are explicit IR facts, not a production compiler.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
WAR	`true`	`false`	Failed

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