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fix codegen for @intCast to u0

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This commit is contained in:
Andrew Kelley
2018-09-17 20:32:51 -04:00
parent 15e59eb142
commit bfcfaaf5bd
3 changed files with 36 additions and 0 deletions
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16
src/codegen.cpp
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@@ -1689,6 +1689,22 @@ static LLVMValueRef gen_widen_or_shorten(CodeGen *g, bool want_runtime_safety, Z
if (actual_type->id == ZigTypeIdFloat) {
return LLVMBuildFPTrunc(g->builder, expr_val, wanted_type->type_ref, "");
} else if (actual_type->id == ZigTypeIdInt) {
if (wanted_bits == 0) {
if (!want_runtime_safety)
return nullptr;
LLVMValueRef zero = LLVMConstNull(actual_type->type_ref);
LLVMValueRef ok_bit = LLVMBuildICmp(g->builder, LLVMIntEQ, expr_val, zero, "");
LLVMBasicBlockRef ok_block = LLVMAppendBasicBlock(g->cur_fn_val, "CastShortenOk");
LLVMBasicBlockRef fail_block = LLVMAppendBasicBlock(g->cur_fn_val, "CastShortenFail");
LLVMBuildCondBr(g->builder, ok_bit, ok_block, fail_block);
LLVMPositionBuilderAtEnd(g->builder, fail_block);
gen_safety_crash(g, PanicMsgIdCastTruncatedData);
LLVMPositionBuilderAtEnd(g->builder, ok_block);
return nullptr;
}
LLVMValueRef trunc_val = LLVMBuildTrunc(g->builder, expr_val, wanted_type->type_ref, "");
if (!want_runtime_safety) {
return trunc_val;