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Mask final word in map_open_close #9

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Mask final word in map_open_close #9

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13 changes: 13 additions & 0 deletions cujson/parse_json_lines.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -983,7 +983,20 @@ void map_open_close(uint32_t* open_close_bitmap, uint32_t* oc_1, int oc_cnt_32,

for(int32_t i = index; i < oc_cnt_32 && i < oc_cnt ; i+=stride){
uint32_t idx = i*4;

uint32_t current_4_bytes = open_close_bitmap[i];

// Fixed: count valid bytes in the last iteration to avoid reading beyond the array bounds
int remaining = oc_cnt - idx;
int valid_bytes = remaining < 4 ? remaining : 4;

/*
* Keep only initialized logical bytes in the final partial word.
* valid_bytes is in [1, 4] for all active loop iterations.
*/
uint32_t valid_mask = 0xFFFFFFFF >> ((4 - valid_bytes) * 8);
current_4_bytes &= valid_mask;


uint32_t isOpen = (__vcmpeq4(current_4_bytes, 0x5B5B5B5B) | __vcmpeq4(current_4_bytes, 0x7B7B7B7B) ) & 0x01010101; // 01
uint32_t isClose = (__vcmpeq4(current_4_bytes, 0x5D5D5D5D) | __vcmpeq4(current_4_bytes, 0x7D7D7D7D) ); // FF
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