From: Richard Henderson <rth@twiddle.net>
Date: Tue, 8 Jul 2014 17:14:09 +0000 (-0700)
Subject: target-alpha: Suppress underflow from CVTTQ if DNZ
X-Git-Tag: qemu-xen-4.7.0-rc1~301^2~3
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=4ed069ab5334a495b49d0704795524fa34e8dbfc;p=qemu-xen.git

target-alpha: Suppress underflow from CVTTQ if DNZ

I.e. respect flush_inputs_to_zero.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---

diff --git a/target-alpha/fpu_helper.c b/target-alpha/fpu_helper.c
index ea1f2e22b9..fa4401d4d6 100644
--- a/target-alpha/fpu_helper.c
+++ b/target-alpha/fpu_helper.c
@@ -452,7 +452,7 @@ static uint64_t do_cvttq(CPUAlphaState *env, uint64_t a, int roundmode)
     frac = a & 0xfffffffffffffull;
 
     if (exp == 0) {
-        if (unlikely(frac != 0)) {
+        if (unlikely(frac != 0) && !env->fp_status.flush_inputs_to_zero) {
             goto do_underflow;
         }
     } else if (exp == 0x7ff) {