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Miscompile when indexing an array with small unsigned types.

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This commit is contained in:
Christoffer Lerno
2024-12-28 17:39:25 +01:00
parent b7082f34a1
commit f5cea221a6
3 changed files with 13 additions and 9 deletions
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3
src/compiler/llvm_codegen_expr.c
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@@ -5292,10 +5292,9 @@ LLVMValueRef llvm_emit_array_gep_raw_index(GenContext *c, LLVMValueRef ptr, LLVM
LLVMTypeRef element_type = LLVMGetElementType(array_type);
Type *index_type = index->type;
ASSERT0(type_is_integer(index_type));
LLVMTypeRef idx_type = llvm_get_type(c, index_type);
if (type_is_unsigned(index_type) && type_size(index_type) < type_size(type_usz))
{
index_val = llvm_zext_trunc(c, index_val, idx_type);
index_val = llvm_zext_trunc(c, index_val, llvm_get_type(c, type_usz));
}
*alignment = type_min_alignment(llvm_abi_size(c, element_type), array_alignment);
return llvm_emit_pointer_inbounds_gep_raw(c, element_type, ptr, index_val);