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stage1: Widen non byte-sized atomic loads/stores

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Checking if the size is a power of two is not enough, should also check
if it's a multiple of 8.

Closes #7976
This commit is contained in:
LemonBoy 2021-05-14 08:31:22 +02:00 committed by Andrew Kelley
parent 2d4d4baa42
commit a52e472307
2 changed files with 4 additions and 4 deletions
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6
src/stage1/codegen.cpp
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@ -5485,8 +5485,8 @@ static enum ZigLLVM_AtomicRMWBinOp to_ZigLLVMAtomicRMWBinOp(AtomicRmwOp op, bool
}
static LLVMTypeRef get_atomic_abi_type(CodeGen *g, IrInstGen *instruction) {
// If the operand type of an atomic operation is not a power of two sized
// we need to widen it before using it and then truncate the result.
// If the operand type of an atomic operation is not byte sized we need to
// widen it before using it and then truncate the result.
ir_assert(instruction->value->type->id == ZigTypeIdPointer, instruction);
ZigType *operand_type = instruction->value->type->data.pointer.child_type;
@ -5498,7 +5498,7 @@ static LLVMTypeRef get_atomic_abi_type(CodeGen *g, IrInstGen *instruction) {
bool is_signed = operand_type->data.integral.is_signed;
ir_assert(bit_count != 0, instruction);
if (bit_count == 1 || !is_power_of_2(bit_count)) {
if (!is_power_of_2(bit_count) || bit_count % 8) {
return get_llvm_type(g, get_int_type(g, is_signed, operand_type->abi_size * 8));
} else {
return nullptr;

2
test/stage1/behavior/atomics.zig
View File

@ -199,7 +199,7 @@ fn testAtomicRmwInt() !void {
test "atomics with different types" {
try testAtomicsWithType(bool, true, false);
inline for (.{ u1, i5, u15 }) |T| {
inline for (.{ u1, i4, u5, i15, u24 }) |T| {
var x: T = 0;
try testAtomicsWithType(T, 0, 1);
}