# Assignment1: RISC-V Assembly and Instruction Pipeline
contributed by < [devarajabc](https://github.com/devarajabc) >

:::danger
Choose one problem (A, B, or C) from [Quiz1](https://hackmd.io/@sysprog/arch2024-quiz1-sol), translate it from C code to a complete RISC-V assembly program, and include the relevant test data.
:::

##

### C code

static inline int my_clz(uint32_t x) {
    int count = 0;
    for (int i = 31; i >= 0; --i) {
        if (x & (1U << i))
            break;
        count++;
    }
    return count;
}

for (int i = 31; i >= 0; --i) {
-        if (x & (1U << i))
-            break;
-        count++;
         count += (x ^ (1U << i)) 
}

static inline uint32_t fp16_to_fp32(uint16_t h) {
    
    const uint32_t w = (uint32_t) h << 16;
    const uint32_t sign = w & UINT32_C(0x80000000);
    const uint32_t nonsign = w & UINT32_C(0x7FFFFFFF);
    
    uint32_t renorm_shift = my_clz(nonsign);
    renorm_shift = renorm_shift > 5 ? renorm_shift - 5 : 0;
    const int32_t inf_nan_mask = ((int32_t)(nonsign + 0x04000000) >> 8) & INT32_C(0x7F800000);
    const int32_t zero_mask = (int32_t)(nonsign - 1) >> 31;
    
    return sign | ((((nonsign << renorm_shift >> 3) + ((0x70 - renorm_shift) << 23)) | inf_nan_mask) & ~zero_mask);
}

-   renorm_shift = renorm_shift > 5 ? renorm_shift - 5 : 0;
+   renorm_shift = (my_clz(nonsign << 6 ) + 1) & (renorm_shift - 1) & ~ renorm_shift;

:::danger
You should automate the testing procedures as much as possible, meaning there's no need to manually check each program output. Instead, implement internal validation to handle the result checking.
:::

### ABI code

### Assembly optimization
## Analysis