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+register: 0.688
+device: 0.679
+ppc: 0.612
+graphic: 0.495
+architecture: 0.486
+assembly: 0.485
+vnc: 0.479
+semantic: 0.460
+permissions: 0.424
+performance: 0.363
+risc-v: 0.314
+boot: 0.291
+kernel: 0.286
+socket: 0.281
+peripherals: 0.256
+network: 0.239
+hypervisor: 0.234
+PID: 0.217
+debug: 0.212
+files: 0.176
+VMM: 0.143
+arm: 0.115
+mistranslation: 0.100
+x86: 0.098
+i386: 0.085
+user-level: 0.065
+TCG: 0.052
+KVM: 0.006
+virtual: 0.006
+
+SH4: SUBV instruction not emulated properly
+Description of problem:
+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.
+Steps to reproduce:
+```c
+#include <stdio.h>
+
+int main(void)
+{
+	register unsigned int a asm("r8") = 0x80000001;
+	register unsigned int b asm("r9") = 0x2;
+	register unsigned int c asm("r10");
+
+	asm volatile("subv %2,%0\n"
+		     "movt %1\n"
+		     : "+r"(a), "=r"(c) : "r"(b) :);
+
+	printf("Values: a=0x%x b=0x%x c=0x%x\n", a, b, c);
+
+	return 0;
+}
+```
+Additional information:
+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`