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-id = 2318
-title = "SH4: SUBV instruction not emulated properly"
-state = "closed"
-created_at = "2024-04-29T17:36:33.900Z"
-closed_at = "2024-05-04T02:01:16.498Z"
-labels = ["target: sh4", "workflow::Patch available"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2318"
-host-os = "Debian testing"
-host-arch = "x86_64"
-qemu-version = "qemu-sh4 version 8.2.1 (Debian 1:8.2.1+ds-2)"
-guest-os = "Buildroot uClibc (qemu-user)"
-guest-arch = "SH4"
-description = """SUBV opcode is emulated incorrectly.
-
-The documentation says:
-
-`SUBV Rm, Rn        Rn - Rm -> Rn, underflow -> T`
-
-Qemu seems to perform the subtraction correctly, but will not detect an underflow."""
-reproduce = """```c
-#include <stdio.h>
-
-int main(void)
-{
-\tregister unsigned int a asm("r8") = 0x80000001;
-\tregister unsigned int b asm("r9") = 0x2;
-\tregister unsigned int c asm("r10");
-
-\tasm volatile("subv %2,%0\\n"
-\t\t     "movt %1\\n"
-\t\t     : "+r"(a), "=r"(c) : "r"(b) :);
-
-\tprintf("Values: a=0x%x b=0x%x c=0x%x\\n", a, b, c);
-
-\treturn 0;
-}
-```"""
-additional = """Tested on real hardware (SEGA Dreamcast, GCC 15.0), the program above prints:
-`Values: a=0x7fffffff b=0x2 c=0x1`
-
-Running with Qemu (and GCC 13.0), the same program prints:
-`Values: a=0x7fffffff b=0x2 c=0x0`"""