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AstGen: use condbr_inline if force_comptime is set

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The `finishThenElseBlock` would correctly use `break_inline`
which would cause Sema to use `addRuntimeBreak` instead of
doing the branch at comptime.
This commit is contained in:
Veikka Tuominen 2022-11-08 16:48:12 +02:00
parent 2897641fb9
commit 89e8bb409a
2 changed files with 30 additions and 4 deletions
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12
src/AstGen.zig
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@ -5294,9 +5294,11 @@ fn orelseCatchExpr(
// up for this fact by calling rvalue on the else branch.
const operand = try reachableExpr(&block_scope, &block_scope.base, operand_ri, lhs, rhs);
const cond = try block_scope.addUnNode(cond_op, operand, node);
const condbr = try block_scope.addCondBr(.condbr, node);
const condbr_tag: Zir.Inst.Tag = if (parent_gz.force_comptime) .condbr_inline else .condbr;
const condbr = try block_scope.addCondBr(condbr_tag, node);
const block = try parent_gz.makeBlockInst(.block, node);
const block_tag: Zir.Inst.Tag = if (parent_gz.force_comptime) .block_inline else .block;
const block = try parent_gz.makeBlockInst(block_tag, node);
try block_scope.setBlockBody(block);
// block_scope unstacked now, can add new instructions to parent_gz
try parent_gz.instructions.append(astgen.gpa, block);
@ -5608,9 +5610,11 @@ fn ifExpr(
}
};
const condbr = try block_scope.addCondBr(.condbr, node);
const condbr_tag: Zir.Inst.Tag = if (parent_gz.force_comptime) .condbr_inline else .condbr;
const condbr = try block_scope.addCondBr(condbr_tag, node);
const block = try parent_gz.makeBlockInst(.block, node);
const block_tag: Zir.Inst.Tag = if (parent_gz.force_comptime) .block_inline else .block;
const block = try parent_gz.makeBlockInst(block_tag, node);
try block_scope.setBlockBody(block);
// block_scope unstacked now, can add new instructions to parent_gz
try parent_gz.instructions.append(astgen.gpa, block);

22
test/cases/compile_errors/branch_in_comptime_only_scope_uses_condbr_inline.zig Normal file
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@ -0,0 +1,22 @@
pub export fn entry1() void {
var x: u32 = 3;
_ = @shuffle(u32, [_]u32{0}, @splat(1, @as(u32, 0)), [_]i8{
if (x > 1) 1 else -1,
});
}
pub export fn entry2() void {
var y: ?i8 = -1;
_ = @shuffle(u32, [_]u32{0}, @splat(1, @as(u32, 0)), [_]i8{
y orelse 1,
});
}
// error
// backend=stage2
// target=native
//
// :4:15: error: unable to resolve comptime value
// :4:15: note: condition in comptime branch must be comptime-known
// :11:11: error: unable to resolve comptime value
// :11:11: note: condition in comptime branch must be comptime-known