motiejus/zig
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result location semantics for vector to array

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```zig
export fn entry() void {
    var x: @Vector(4, i32) = undefined;
    var y: [4]i32 = x;
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %x = alloca <4 x i32>, align 16
  %y = alloca [4 x i32], align 4
  %0 = bitcast <4 x i32>* %x to i8*, !dbg !47
  call void @llvm.memset.p0i8.i64(i8* align 16 %0, i8 -86, i64 16, i1 false), !dbg !47
  call void @llvm.dbg.declare(metadata <4 x i32>* %x, metadata !39, metadata !DIExpression()), !dbg !47
  %1 = load <4 x i32>, <4 x i32>* %x, align 16, !dbg !48
  %2 = bitcast [4 x i32]* %y to <4 x i32>*, !dbg !48
  store <4 x i32> %1, <4 x i32>* %2, align 16, !dbg !48
  call void @llvm.dbg.declare(metadata [4 x i32]* %y, metadata !45, metadata !DIExpression()), !dbg !49
  ret void, !dbg !50
}
```
This commit is contained in:
Andrew Kelley
2019-06-10 19:49:24 -04:00
parent 9a324ecb42
commit 4582ec518f
4 changed files with 17 additions and 16 deletions
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10
src/codegen.cpp
View File

@@ -5386,12 +5386,12 @@ static LLVMValueRef ir_render_vector_to_array(CodeGen *g, IrExecutable *executab
ZigType *array_type = instruction->base.value.type;
assert(array_type->id == ZigTypeIdArray);
assert(handle_is_ptr(array_type));
assert(instruction->tmp_ptr);
LLVMValueRef result_loc = ir_llvm_value(g, instruction->result_loc);
LLVMValueRef vector = ir_llvm_value(g, instruction->vector);
LLVMValueRef casted_ptr = LLVMBuildBitCast(g->builder, instruction->tmp_ptr,
LLVMValueRef casted_ptr = LLVMBuildBitCast(g->builder, result_loc,
LLVMPointerType(get_llvm_type(g, instruction->vector->value.type), 0), "");
gen_store_untyped(g, vector, casted_ptr, 0, false);
return instruction->tmp_ptr;
return result_loc;
}
static LLVMValueRef ir_render_array_to_vector(CodeGen *g, IrExecutable *executable,
@@ -6838,10 +6838,6 @@ static void do_code_gen(CodeGen *g) {
slot = &ref_instruction->tmp_ptr;
assert(instruction->value.type->id == ZigTypeIdPointer);
slot_type = instruction->value.type->data.pointer.child_type;
} else if (instruction->id == IrInstructionIdVectorToArray) {
IrInstructionVectorToArray *vector_to_array_instruction = (IrInstructionVectorToArray *)instruction;
alignment_bytes = get_abi_alignment(g, vector_to_array_instruction->vector->value.type);
slot = &vector_to_array_instruction->tmp_ptr;
} else {
zig_unreachable();
}