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authorChristian Krinitsin <mail@krinitsin.com>2025-07-08 13:28:15 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-07-08 13:28:28 +0200
commit5aa276efcbd67f4300ca1a7f809c6e00aadb03da (patch)
tree9b8f0e074014cda8d42f5a97a95bc25082d8b764 /results/classifier/zero-shot-user-mode/output/instruction/2386
parent1a3c4faf4e0a25ed0b86e8739d5319a634cb9112 (diff)
downloadqemu-analysis-5aa276efcbd67f4300ca1a7f809c6e00aadb03da.tar.gz
qemu-analysis-5aa276efcbd67f4300ca1a7f809c6e00aadb03da.zip
restructure results
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@@ -1,49 +0,0 @@
-instruction: 0.625
-runtime: 0.218
-syscall: 0.157
-
-
-
-RISCV - Incorrect behaviour of the SLL instruction
-Description of problem:
-`SLL` (and probably other similar instructions) produce incorrect results. To quote the [RISCV ISA manual](https://drive.google.com/file/d/1uviu1nH-tScFfgrovvFCrj7Omv8tFtkp/view):
-
-> SLL, SRL, and SRA perform logical left, logical right, and arithmetic right shifts on the value in register
-rs1 by the shift amount held in the lower 5 bits of register rs2.
-
-This instruction should perform a logical shift left by the shift amount from the lower 5 bits held in the third operand, however, it doesn't seem to be the case. As can be seen from the result of the snippet below: `55c3585000000000`, it seems that it calculates the correct value, but then shifts it by another 32 bits to the left:
-
-```python
-correct_shift_res = (0xDB4D6868655C3585 << (0x69C99AB9B9401024 & 0b11111)) & (2 ** 64 - 1)
-incorrect_qemu_produced = (correct_shift_res << 32) & (2 ** 64 - 1)
-```
-Steps to reproduce:
-1. Compile the attached source file: `riscv64-linux-gnu-gcc -static repro.c -o ./repro.elf`
-
-```c
-#include <stdint.h>
-#include <stdio.h>
-
-int main() {
-  uint64_t a = 0x69C99AB9B9401024;
-  uint64_t b = 0xDB4D6868655C3585;
-  uint64_t c;
-
-  asm volatile("sll %0, %1, %2" : "=r"(c) : "r"(b), "r"(a));
-
-  printf("s8      : %lx\n", c);
-  printf("expected: %lx\n", 0xb4d6868655c35850);
-
-  return 0;
-}
-```
-
-2. Run qemu: `./qemu-riscv64 ./repro.elf`
-3. You will see the output and what the result of the computation should really be:
-
-```
-s8      : 55c3585000000000
-expected: b4d6868655c35850
-```
-Additional information:
-