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

[Richard Henderson]

On 5/2/23 19:57, Stafford Horne wrote:

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

Signed-off-by: Stafford Horne <sho...@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);

You don't mention the nan change in the commit message.


r~