motiejus/zig
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result location semantics for @bitCast

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```zig
export fn entry() void {
    var x = @bitCast(f32, foo());
}
```

```llvm
define void @entry() #2 !dbg !35 {
Entry:
  %x = alloca float, align 4
  %0 = bitcast float* %x to %Foo*, !dbg !42
  call fastcc void @foo(%Foo* sret %0), !dbg !42
  call void @llvm.dbg.declare(metadata float* %x, metadata !39, metadata !DIExpression()), !dbg !43
  ret void, !dbg !44
}
```
This commit is contained in:
Andrew Kelley
2019-06-10 12:24:19 -04:00
parent 1a51bf6304
commit 17b1ac5d03
5 changed files with 103 additions and 130 deletions
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14
src/codegen.cpp
View File

@@ -3145,12 +3145,7 @@ static LLVMValueRef ir_render_bit_cast(CodeGen *g, IrExecutable *executable,
uint32_t alignment = get_abi_alignment(g, actual_type);
return gen_load_untyped(g, bitcasted_ptr, alignment, false, "");
} else {
assert(instruction->tmp_ptr != nullptr);
LLVMTypeRef wanted_ptr_type_ref = LLVMPointerType(get_llvm_type(g, actual_type), 0);
LLVMValueRef bitcasted_ptr = LLVMBuildBitCast(g->builder, instruction->tmp_ptr, wanted_ptr_type_ref, "");
uint32_t alignment = get_abi_alignment(g, wanted_type);
gen_store_untyped(g, value, bitcasted_ptr, alignment, false);
return instruction->tmp_ptr;
zig_unreachable();
}
}
@@ -5520,7 +5515,6 @@ static LLVMValueRef ir_render_instruction(CodeGen *g, IrExecutable *executable,
case IrInstructionIdPtrCastSrc:
case IrInstructionIdCmpxchgSrc:
case IrInstructionIdLoadPtr:
case IrInstructionIdBitCast:
case IrInstructionIdGlobalAsm:
case IrInstructionIdHasDecl:
case IrInstructionIdUndeclaredIdent:
@@ -6837,9 +6831,6 @@ 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 == IrInstructionIdContainerInitList) {
IrInstructionContainerInitList *container_init_list_instruction = (IrInstructionContainerInitList *)instruction;
slot = &container_init_list_instruction->tmp_ptr;
} else if (instruction->id == IrInstructionIdSlice) {
IrInstructionSlice *slice_instruction = (IrInstructionSlice *)instruction;
slot = &slice_instruction->tmp_ptr;
@@ -6861,9 +6852,6 @@ static void do_code_gen(CodeGen *g) {
} else if (instruction->id == IrInstructionIdLoadPtrGen) {
IrInstructionLoadPtrGen *load_ptr_inst = (IrInstructionLoadPtrGen *)instruction;
slot = &load_ptr_inst->tmp_ptr;
} else if (instruction->id == IrInstructionIdBitCastGen) {
IrInstructionBitCastGen *bit_cast_inst = (IrInstructionBitCastGen *)instruction;
slot = &bit_cast_inst->tmp_ptr;
} 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);