Here is a shorter test case:
% cat rdrand.c
int main(void) {
asm(".byte 0x66, 0xF, 0xC7, 0xF0, 0xBA, 0x1");
return 0;
}
Disassembled by gdb as:
0x00000000004004a0 <+0>: mov eax,0x0
0x00000000004004a5 <+5>: mov DWORD PTR [rsp-0x4],0x0
0x00000000004004ad <+13>: rdrand ax
0x00000000004004b1 <+17>: mov edx,0x9090c301
** Changed in: valgrind (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/852795
Title:
valgrind does not support ivybridge rdrand instruction
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