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mtfsf: fix FPSCR_VX and FPSCR_FEX computation 

The patch below fixes the computation of FPSCR_VX and FPSCR_FEX when
using the mtfsf instruction. As stated in the PowerPC manual the mtfsf
instruction can't alter those bit, and thus it should always be
computed.

Acked by Jocelyn Mayer.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4034 c046a42c-6fe2-441c-8c8c-71466251a162
master
aurel32 2008-03-10 00:09:28 +00:00
parent 0badc1ee0e
commit 5567025f53
1 changed files with 4 additions and 0 deletions
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4
target-ppc/op_helper.c
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@ -888,12 +888,16 @@ void do_store_fpscr (uint32_t mask)
/* Update VX and FEX */
if (fpscr_ix != 0)
env->fpscr |= 1 << FPSCR_VX;
else
env->fpscr &= ~(1 << FPSCR_VX);
if ((fpscr_ex & fpscr_eex) != 0) {
env->fpscr |= 1 << FPSCR_FEX;
env->exception_index = POWERPC_EXCP_PROGRAM;
/* XXX: we should compute it properly */
env->error_code = POWERPC_EXCP_FP;
}
else
env->fpscr &= ~(1 << FPSCR_FEX);
fpscr_set_rounding_mode();
}
#undef WORD0