| Message ID | 20241025141254.2141506-18-peter.maydell@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | softfloat: Set 2-NaN propagation rule in float_status, not at compile time | expand |
On 10/25/24 15:12, Peter Maydell wrote: > Although the floating point rounding mode for Microblaze is always > nearest-even, we cannot set it just once in the CPU initfn. This is > because env->fp_status is in the part of the CPU state struct that is > zeroed on reset. > > Move the call to set_float_rounding_mode() into the reset fn. > > (This had no guest-visible effects because it happens that the > float_round_nearest_even enum value is 0, so when the struct was > zeroed it didn't corrupt the setting.) > > Signed-off-by: Peter Maydell <peter.maydell@linaro.org> > --- > target/microblaze/cpu.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) Reviewed-by: Richard Henderson <richard.henderson@linaro.org> r~
diff --git a/target/microblaze/cpu.c b/target/microblaze/cpu.c index 135947ee800..6329a774331 100644 --- a/target/microblaze/cpu.c +++ b/target/microblaze/cpu.c @@ -201,6 +201,8 @@ static void mb_cpu_reset_hold(Object *obj, ResetType type) env->pc = cpu->cfg.base_vectors; + set_float_rounding_mode(float_round_nearest_even, &env->fp_status); + #if defined(CONFIG_USER_ONLY) /* start in user mode with interrupts enabled. */ mb_cpu_write_msr(env, MSR_EE | MSR_IE | MSR_VM | MSR_UM); @@ -311,15 +313,12 @@ static void mb_cpu_realizefn(DeviceState *dev, Error **errp) static void mb_cpu_initfn(Object *obj) { MicroBlazeCPU *cpu = MICROBLAZE_CPU(obj); - CPUMBState *env = &cpu->env; gdb_register_coprocessor(CPU(cpu), mb_cpu_gdb_read_stack_protect, mb_cpu_gdb_write_stack_protect, gdb_find_static_feature("microblaze-stack-protect.xml"), 0); - set_float_rounding_mode(float_round_nearest_even, &env->fp_status); - #ifndef CONFIG_USER_ONLY /* Inbound IRQ and FIR lines */ qdev_init_gpio_in(DEVICE(cpu), microblaze_cpu_set_irq, 2);
Although the floating point rounding mode for Microblaze is always nearest-even, we cannot set it just once in the CPU initfn. This is because env->fp_status is in the part of the CPU state struct that is zeroed on reset. Move the call to set_float_rounding_mode() into the reset fn. (This had no guest-visible effects because it happens that the float_round_nearest_even enum value is 0, so when the struct was zeroed it didn't corrupt the setting.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- target/microblaze/cpu.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)