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target/ppc: Fix do_float_check_status vs inexact 

The underflow and inexact exceptions are not mutually exclusive.
Check for both of them.  Tidy the reset of FPSCR[FI].

Fixes: https://bugs.launchpad.net/bugs/1841442
Reported-by: Paul Clarke <pc@us.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Paul Clarke <pc@us.ibm.com>
Message-Id: <20190826165434.18403-2-richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Richard Henderson 2019-08-26 09:54:34 -07:00 committed by David Gibson
parent cbc65a8f22
commit 16ce2fffa6
1 changed files with 3 additions and 7 deletions
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10
target/ppc/fpu_helper.c
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@ -630,19 +630,15 @@ static void do_float_check_status(CPUPPCState *env, uintptr_t raddr)
{
CPUState *cs = env_cpu(env);
int status = get_float_exception_flags(&env->fp_status);
bool inexact_happened = false;
if (status & float_flag_overflow) {
float_overflow_excp(env);
} else if (status & float_flag_underflow) {
float_underflow_excp(env);
} else if (status & float_flag_inexact) {
float_inexact_excp(env);
inexact_happened = true;
}
/* if the inexact flag was not set */
if (inexact_happened == false) {
if (status & float_flag_inexact) {
float_inexact_excp(env);
} else {
env->fpscr &= ~(1 << FPSCR_FI); /* clear the FPSCR[FI] bit */
}