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don't pass zero-length @memset to the backend

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xdBronch 2025-10-03 19:37:51 -04:00 committed by Alex Rønne Petersen
parent 7de67e6802
commit cfb5350ed4
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2 changed files with 6 additions and 1 deletions
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2
src/Sema.zig
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@ -25299,7 +25299,6 @@ fn zirMemset(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!void
const elem = try sema.coerce(block, dest_elem_ty, uncoerced_elem, value_src); const elem = try sema.coerce(block, dest_elem_ty, uncoerced_elem, value_src);
const runtime_src = rs: { const runtime_src = rs: {
const ptr_val = try sema.resolveDefinedValue(block, dest_src, dest_ptr) orelse break :rs dest_src;
const len_air_ref = try sema.fieldVal(block, src, dest_ptr, try ip.getOrPutString(gpa, pt.tid, "len", .no_embedded_nulls), dest_src); const len_air_ref = try sema.fieldVal(block, src, dest_ptr, try ip.getOrPutString(gpa, pt.tid, "len", .no_embedded_nulls), dest_src);
const len_val = (try sema.resolveDefinedValue(block, dest_src, len_air_ref)) orelse break :rs dest_src; const len_val = (try sema.resolveDefinedValue(block, dest_src, len_air_ref)) orelse break :rs dest_src;
const len_u64 = try len_val.toUnsignedIntSema(pt); const len_u64 = try len_val.toUnsignedIntSema(pt);
@ -25309,6 +25308,7 @@ fn zirMemset(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!void
return; return;
} }
const ptr_val = try sema.resolveDefinedValue(block, dest_src, dest_ptr) orelse break :rs dest_src;
if (!sema.isComptimeMutablePtr(ptr_val)) break :rs dest_src; if (!sema.isComptimeMutablePtr(ptr_val)) break :rs dest_src;
const elem_val = try sema.resolveValue(elem) orelse break :rs value_src; const elem_val = try sema.resolveValue(elem) orelse break :rs value_src;
const array_ty = try pt.arrayType(.{ const array_ty = try pt.arrayType(.{

5
test/behavior/memset.zig
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@ -175,3 +175,8 @@ test "zero keys with @memset" {
try expect(!Keys.keys.left); try expect(!Keys.keys.left);
try expect(!Keys.keys.right); try expect(!Keys.keys.right);
} }
test "@memset with zero-length array" {
var array: [0]usize = undefined;
@memset(&array, 0);
}