[PATCH 3/3] target/openrisc: Setup FPU for detecting tininess before rounding

From: Stafford Horne <shorne@gmail.com>
To: QEMU Development <qemu-devel@nongnu.org>
Cc: Linux OpenRISC <linux-openrisc@vger.kernel.org>,
	Stafford Horne <shorne@gmail.com>
Subject: [PATCH 3/3] target/openrisc: Setup FPU for detecting tininess before rounding
Date: Tue,  2 May 2023 19:57:31 +0100	[thread overview]
Message-ID: <20230502185731.3543420-4-shorne@gmail.com> (raw)
In-Reply-To: <20230502185731.3543420-1-shorne@gmail.com>

OpenRISC defines tininess to be detected before rounding.  Setup qemu to
obey this.

Signed-off-by: Stafford Horne <shorne@gmail.com>
---
 target/openrisc/cpu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/openrisc/cpu.c b/target/openrisc/cpu.c
index 0ce4f796fa..cdbff26fb5 100644
--- a/target/openrisc/cpu.c
+++ b/target/openrisc/cpu.c
@@ -22,6 +22,7 @@
 #include "qemu/qemu-print.h"
 #include "cpu.h"
 #include "exec/exec-all.h"
+#include "fpu/softfloat-helpers.h"
 #include "tcg/tcg.h"
 
 static void openrisc_cpu_set_pc(CPUState *cs, vaddr value)
@@ -90,6 +91,10 @@ static void openrisc_cpu_reset_hold(Object *obj)
     s->exception_index = -1;
     cpu_set_fpcsr(&cpu->env, 0);
 
+    set_default_nan_mode(1, &cpu->env.fp_status);
+    set_float_detect_tininess(float_tininess_before_rounding,
+                              &cpu->env.fp_status);
+
 #ifndef CONFIG_USER_ONLY
     cpu->env.picmr = 0x00000000;
     cpu->env.picsr = 0x00000000;
-- 
2.39.1


