* [PATCH] target/alpha: Do not mix exception flags and FPCR bits
@ 2025-02-11 16:26 Philippe Mathieu-Daudé
2025-02-11 16:49 ` Richard Henderson
2025-03-06 13:13 ` Philippe Mathieu-Daudé
0 siblings, 2 replies; 3+ messages in thread
From: Philippe Mathieu-Daudé @ 2025-02-11 16:26 UTC (permalink / raw)
To: qemu-devel; +Cc: Peter Maydell, Richard Henderson, Philippe Mathieu-Daudé
get_float_exception_flags() returns exception flags,
which are distinct from the FPCR bits used as error code.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
Based-on: <20250211130626.3940412-1-peter.maydell@linaro.org>
---
target/alpha/fpu_helper.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/target/alpha/fpu_helper.c b/target/alpha/fpu_helper.c
index f810a9b6a47..6aefb9b851a 100644
--- a/target/alpha/fpu_helper.c
+++ b/target/alpha/fpu_helper.c
@@ -455,29 +455,28 @@ static uint64_t do_cvttq(CPUAlphaState *env, uint64_t a, int roundmode)
{
float64 fa;
int64_t ret;
- uint32_t exc;
+ uint32_t exc = 0;
+ int flags;
fa = t_to_float64(a);
ret = float64_to_int64_modulo(fa, roundmode, &FP_STATUS);
- exc = get_float_exception_flags(&FP_STATUS);
- if (unlikely(exc)) {
+ flags = get_float_exception_flags(&FP_STATUS);
+ if (unlikely(flags)) {
set_float_exception_flags(0, &FP_STATUS);
/* We need to massage the resulting exceptions. */
- if (exc & float_flag_invalid_cvti) {
+ if (flags & float_flag_invalid_cvti) {
/* Overflow, either normal or infinity. */
if (float64_is_infinity(fa)) {
exc = FPCR_INV;
} else {
exc = FPCR_IOV | FPCR_INE;
}
- } else if (exc & float_flag_invalid) {
+ } else if (flags & float_flag_invalid) {
exc = FPCR_INV;
- } else if (exc & float_flag_inexact) {
+ } else if (flags & float_flag_inexact) {
exc = FPCR_INE;
- } else {
- exc = 0;
}
}
env->error_code = exc;
--
2.47.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] target/alpha: Do not mix exception flags and FPCR bits
2025-02-11 16:26 [PATCH] target/alpha: Do not mix exception flags and FPCR bits Philippe Mathieu-Daudé
@ 2025-02-11 16:49 ` Richard Henderson
2025-03-06 13:13 ` Philippe Mathieu-Daudé
1 sibling, 0 replies; 3+ messages in thread
From: Richard Henderson @ 2025-02-11 16:49 UTC (permalink / raw)
To: Philippe Mathieu-Daudé, qemu-devel; +Cc: Peter Maydell
On 2/11/25 08:26, Philippe Mathieu-Daudé wrote:
> get_float_exception_flags() returns exception flags,
> which are distinct from the FPCR bits used as error code.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
> Based-on: <20250211130626.3940412-1-peter.maydell@linaro.org>
> ---
> target/alpha/fpu_helper.c | 15 +++++++--------
> 1 file changed, 7 insertions(+), 8 deletions(-)
Yes, this is clearer.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
r~
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] target/alpha: Do not mix exception flags and FPCR bits
2025-02-11 16:26 [PATCH] target/alpha: Do not mix exception flags and FPCR bits Philippe Mathieu-Daudé
2025-02-11 16:49 ` Richard Henderson
@ 2025-03-06 13:13 ` Philippe Mathieu-Daudé
1 sibling, 0 replies; 3+ messages in thread
From: Philippe Mathieu-Daudé @ 2025-03-06 13:13 UTC (permalink / raw)
To: qemu-devel; +Cc: Peter Maydell, Richard Henderson
On 11/2/25 17:26, Philippe Mathieu-Daudé wrote:
> get_float_exception_flags() returns exception flags,
> which are distinct from the FPCR bits used as error code.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
> Based-on: <20250211130626.3940412-1-peter.maydell@linaro.org>
> ---
> target/alpha/fpu_helper.c | 15 +++++++--------
> 1 file changed, 7 insertions(+), 8 deletions(-)
Patch queued, thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
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