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Fix shifting buf in lb_copy_bits

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gingerBill
2026-06-15 17:13:33 +01:00
parent ee5d5d6882
commit c91d3f120c
1 changed files with 19 additions and 7 deletions
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26
src/llvm_backend_general.cpp
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@@ -1016,16 +1016,28 @@ gb_internal void lb_copy_bits(lbProcedure *p,
} else {
// a = intrinsics.unaligned_load((^u64)(&src[src_byte]))
a = OdinLLVMBuildUnalignedLoad(p, ptr_offset(p, src, src_byte), t_u64_ptr);
// b = intrinsics.unaligned_load((^u64)(&src[src_byte + 8]))
b = OdinLLVMBuildUnalignedLoad(p, ptr_offset(p, src, src_byte + 8), t_u64_ptr);
if (src_need_bytes > 8) {
// b = intrinsics.unaligned_load((^u64)(&src[src_byte + 8]))
b = OdinLLVMBuildUnalignedLoad(p, ptr_offset(p, src, src_byte + 8), t_u64_ptr);
}
}
// bits := (a >> src_shift) | (b << (64 - src_shift))
LLVMValueRef hi;
if (src_shift == 0) {
hi = LLVMConstInt(llvm_u64, 0, false);
} else {
hi = LLVMBuildShl(p->builder, b, LLVMConstInt(llvm_u64, 64 - src_shift, false), "");
}
LLVMValueRef bits = LLVMBuildOr(p->builder,
LLVMBuildLShr(p->builder, a, LLVMConstInt(llvm_u64, src_shift, false), ""),
LLVMBuildShl (p->builder, b, LLVMConstInt(llvm_u64, 64 - src_shift, false), ""),
""
);
LLVMBuildLShr(p->builder, a, LLVMConstInt(llvm_u64, src_shift, false), ""),
hi, "");
// // bits := (a >> src_shift) | (b << (64 - src_shift))
// LLVMValueRef bits = LLVMBuildOr(p->builder,
// LLVMBuildLShr(p->builder, a, LLVMConstInt(llvm_u64, src_shift, false), ""),
// LLVMBuildShl (p->builder, b, LLVMConstInt(llvm_u64, 64 - src_shift, false), ""),
// ""
// );
u64 mask = ~cast(u64)0;
if (size_bits < 64) {
mask = ((cast(u64)1)<<size_bits)-1;