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make codegen smarter around !

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This commit is contained in:
nora 2023-07-30 21:16:01 +02:00
parent 1dad80f4c1
commit 0c996eb9bc
2 changed files with 15 additions and 7 deletions
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2
src/index.ts
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@ -12,7 +12,7 @@ import { exec } from "child_process";
const input = ` const input = `
function main() = ( function main() = (
let i = 0; let i = 0;
loop break;
loop ( loop (
if i > 10 then break; if i > 10 then break;

12
src/lower.ts
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@ -577,10 +577,14 @@ function lowerExpr(fcx: FuncContext, instrs: wasm.Instr[], expr: Expr) {
fcx.currentBlockDepth += 2; fcx.currentBlockDepth += 2;
const bodyInstrs: wasm.Instr[] = []; const bodyInstrs: wasm.Instr[] = [];
lowerExpr(fcx, bodyInstrs, expr.body); lowerExpr(fcx, bodyInstrs, expr.body);
// For diverging bodies, we don't need to bother creating the back edge.
if (expr.body.ty!.kind !== "never") {
bodyInstrs.push({ bodyInstrs.push({
kind: "br", kind: "br",
label: /*innermost control structure, the loop*/ 0, label: /*innermost control structure, the loop*/ 0,
}); });
}
fcx.currentBlockDepth -= 2; fcx.currentBlockDepth -= 2;
outerBlockInstrs.push({ outerBlockInstrs.push({
@ -633,11 +637,15 @@ function lowerExprBlockBody(
const headExprs = expr.exprs.slice(0, -1); const headExprs = expr.exprs.slice(0, -1);
const tailExpr = expr.exprs[expr.exprs.length - 1]; const tailExpr = expr.exprs[expr.exprs.length - 1];
headExprs.forEach((inner) => { for (const inner of headExprs) {
lowerExpr(fcx, innerInstrs, inner); lowerExpr(fcx, innerInstrs, inner);
if (inner.ty!.kind === "never") {
// The rest of the block is unreachable, so we don't bother codegening it.
break;
}
const types = wasmTypeForBody(inner.ty!); const types = wasmTypeForBody(inner.ty!);
types.forEach(() => innerInstrs.push({ kind: "drop" })); types.forEach(() => innerInstrs.push({ kind: "drop" }));
}); }
lowerExpr(fcx, innerInstrs, tailExpr); lowerExpr(fcx, innerInstrs, tailExpr);