* Fix real_2expN mode arguments in fixed-value.c
@ 2015-10-29 15:30 Richard Sandiford
2015-10-29 15:47 ` Bernd Schmidt
2015-10-29 16:23 ` Richard Biener
0 siblings, 2 replies; 4+ messages in thread
From: Richard Sandiford @ 2015-10-29 15:30 UTC (permalink / raw)
To: gcc-patches
fixed-value.c was passing a fixed-point mode to the floating-point
real_2expN routine. That didn't cause a problem in practice because
all real_2expN did was check for decimal float modes, but it triggered
a failure with an upcoming patch.
Tested on x86_64-linux-gnu, arm-linux-gnueabi and aarch64-linux-gnu.
OK to install?
Thanks,
Richard
gcc/
* fixed-value.c (check_real_for_fixed_mode, fixed_from_string)
(fixed_to_decimal, fixed_convert_from_real)
(real_convert_from_fixed): Fix mode arguments to real_2expN.
diff --git a/gcc/fixed-value.c b/gcc/fixed-value.c
index 39bdebe..a38045f 100644
--- a/gcc/fixed-value.c
+++ b/gcc/fixed-value.c
@@ -64,8 +64,8 @@ check_real_for_fixed_mode (REAL_VALUE_TYPE *real_value, machine_mode mode)
{
REAL_VALUE_TYPE max_value, min_value, epsilon_value;
- real_2expN (&max_value, GET_MODE_IBIT (mode), mode);
- real_2expN (&epsilon_value, -GET_MODE_FBIT (mode), mode);
+ real_2expN (&max_value, GET_MODE_IBIT (mode), VOIDmode);
+ real_2expN (&epsilon_value, -GET_MODE_FBIT (mode), VOIDmode);
if (SIGNED_FIXED_POINT_MODE_P (mode))
min_value = real_value_negate (&max_value);
@@ -127,7 +127,7 @@ fixed_from_string (FIXED_VALUE_TYPE *f, const char *str, machine_mode mode)
|| (temp == FIXED_MAX_EPS && ALL_ACCUM_MODE_P (f->mode)))
warning (OPT_Woverflow,
"large fixed-point constant implicitly truncated to fixed-point type");
- real_2expN (&base_value, fbit, mode);
+ real_2expN (&base_value, fbit, VOIDmode);
real_arithmetic (&fixed_value, MULT_EXPR, &real_value, &base_value);
wide_int w = real_to_integer (&fixed_value, &fail,
GET_MODE_PRECISION (mode));
@@ -158,7 +158,7 @@ fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *f_orig,
REAL_VALUE_TYPE real_value, base_value, fixed_value;
signop sgn = UNSIGNED_FIXED_POINT_MODE_P (f_orig->mode) ? UNSIGNED : SIGNED;
- real_2expN (&base_value, GET_MODE_FBIT (f_orig->mode), f_orig->mode);
+ real_2expN (&base_value, GET_MODE_FBIT (f_orig->mode), VOIDmode);
real_from_integer (&real_value, VOIDmode,
wide_int::from (f_orig->data,
GET_MODE_PRECISION (f_orig->mode), sgn),
@@ -1052,7 +1052,7 @@ fixed_convert_from_real (FIXED_VALUE_TYPE *f, machine_mode mode,
real_value = *a;
f->mode = mode;
- real_2expN (&base_value, fbit, mode);
+ real_2expN (&base_value, fbit, VOIDmode);
real_arithmetic (&fixed_value, MULT_EXPR, &real_value, &base_value);
wide_int w = real_to_integer (&fixed_value, &fail,
@@ -1104,7 +1104,7 @@ real_convert_from_fixed (REAL_VALUE_TYPE *r, machine_mode mode,
REAL_VALUE_TYPE base_value, fixed_value, real_value;
signop sgn = UNSIGNED_FIXED_POINT_MODE_P (f->mode) ? UNSIGNED : SIGNED;
- real_2expN (&base_value, GET_MODE_FBIT (f->mode), f->mode);
+ real_2expN (&base_value, GET_MODE_FBIT (f->mode), VOIDmode);
real_from_integer (&fixed_value, VOIDmode,
wide_int::from (f->data, GET_MODE_PRECISION (f->mode),
sgn), sgn);
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Fix real_2expN mode arguments in fixed-value.c
2015-10-29 15:30 Fix real_2expN mode arguments in fixed-value.c Richard Sandiford
@ 2015-10-29 15:47 ` Bernd Schmidt
2015-10-29 16:09 ` Richard Sandiford
2015-10-29 16:23 ` Richard Biener
1 sibling, 1 reply; 4+ messages in thread
From: Bernd Schmidt @ 2015-10-29 15:47 UTC (permalink / raw)
To: gcc-patches, richard.sandiford
On 10/29/2015 04:28 PM, Richard Sandiford wrote:
> * fixed-value.c (check_real_for_fixed_mode, fixed_from_string)
> (fixed_to_decimal, fixed_convert_from_real)
> (real_convert_from_fixed): Fix mode arguments to real_2expN.
Passing VOIDmode rather than the real mode is a bit of a strange fix.
Why can't the called function deal with the proper mode? (real_2expN
also doesn't document the mode argument which should be fixed).
Bernd
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Fix real_2expN mode arguments in fixed-value.c
2015-10-29 15:47 ` Bernd Schmidt
@ 2015-10-29 16:09 ` Richard Sandiford
0 siblings, 0 replies; 4+ messages in thread
From: Richard Sandiford @ 2015-10-29 16:09 UTC (permalink / raw)
To: Bernd Schmidt; +Cc: gcc-patches
Bernd Schmidt <bschmidt@redhat.com> writes:
> On 10/29/2015 04:28 PM, Richard Sandiford wrote:
>> * fixed-value.c (check_real_for_fixed_mode, fixed_from_string)
>> (fixed_to_decimal, fixed_convert_from_real)
>> (real_convert_from_fixed): Fix mode arguments to real_2expN.
>
> Passing VOIDmode rather than the real mode is a bit of a strange fix.
> Why can't the called function deal with the proper mode? (real_2expN
> also doesn't document the mode argument which should be fixed).
VOIDmode is the usual real.[hc] way of getting maximum precision,
which I think is the natural choice for these temporary real_values.
The mode only becomes significant when you want to round the result.
Thanks,
Richard
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Fix real_2expN mode arguments in fixed-value.c
2015-10-29 15:30 Fix real_2expN mode arguments in fixed-value.c Richard Sandiford
2015-10-29 15:47 ` Bernd Schmidt
@ 2015-10-29 16:23 ` Richard Biener
1 sibling, 0 replies; 4+ messages in thread
From: Richard Biener @ 2015-10-29 16:23 UTC (permalink / raw)
To: Richard Sandiford, gcc-patches
On October 29, 2015 4:28:05 PM GMT+01:00, Richard Sandiford <richard.sandiford@arm.com> wrote:
>fixed-value.c was passing a fixed-point mode to the floating-point
>real_2expN routine. That didn't cause a problem in practice because
>all real_2expN did was check for decimal float modes, but it triggered
>a failure with an upcoming patch.
>
>Tested on x86_64-linux-gnu, arm-linux-gnueabi and aarch64-linux-gnu.
>OK to install?
OK.
Richard.
>Thanks,
>Richard
>
>
>gcc/
> * fixed-value.c (check_real_for_fixed_mode, fixed_from_string)
> (fixed_to_decimal, fixed_convert_from_real)
> (real_convert_from_fixed): Fix mode arguments to real_2expN.
>
>diff --git a/gcc/fixed-value.c b/gcc/fixed-value.c
>index 39bdebe..a38045f 100644
>--- a/gcc/fixed-value.c
>+++ b/gcc/fixed-value.c
>@@ -64,8 +64,8 @@ check_real_for_fixed_mode (REAL_VALUE_TYPE
>*real_value, machine_mode mode)
> {
> REAL_VALUE_TYPE max_value, min_value, epsilon_value;
>
>- real_2expN (&max_value, GET_MODE_IBIT (mode), mode);
>- real_2expN (&epsilon_value, -GET_MODE_FBIT (mode), mode);
>+ real_2expN (&max_value, GET_MODE_IBIT (mode), VOIDmode);
>+ real_2expN (&epsilon_value, -GET_MODE_FBIT (mode), VOIDmode);
>
> if (SIGNED_FIXED_POINT_MODE_P (mode))
> min_value = real_value_negate (&max_value);
>@@ -127,7 +127,7 @@ fixed_from_string (FIXED_VALUE_TYPE *f, const char
>*str, machine_mode mode)
> || (temp == FIXED_MAX_EPS && ALL_ACCUM_MODE_P (f->mode)))
> warning (OPT_Woverflow,
> "large fixed-point constant implicitly truncated to fixed-point
>type");
>- real_2expN (&base_value, fbit, mode);
>+ real_2expN (&base_value, fbit, VOIDmode);
> real_arithmetic (&fixed_value, MULT_EXPR, &real_value, &base_value);
> wide_int w = real_to_integer (&fixed_value, &fail,
> GET_MODE_PRECISION (mode));
>@@ -158,7 +158,7 @@ fixed_to_decimal (char *str, const FIXED_VALUE_TYPE
>*f_orig,
> REAL_VALUE_TYPE real_value, base_value, fixed_value;
>
>signop sgn = UNSIGNED_FIXED_POINT_MODE_P (f_orig->mode) ? UNSIGNED :
>SIGNED;
>- real_2expN (&base_value, GET_MODE_FBIT (f_orig->mode),
>f_orig->mode);
>+ real_2expN (&base_value, GET_MODE_FBIT (f_orig->mode), VOIDmode);
> real_from_integer (&real_value, VOIDmode,
> wide_int::from (f_orig->data,
> GET_MODE_PRECISION (f_orig->mode), sgn),
>@@ -1052,7 +1052,7 @@ fixed_convert_from_real (FIXED_VALUE_TYPE *f,
>machine_mode mode,
>
> real_value = *a;
> f->mode = mode;
>- real_2expN (&base_value, fbit, mode);
>+ real_2expN (&base_value, fbit, VOIDmode);
> real_arithmetic (&fixed_value, MULT_EXPR, &real_value, &base_value);
>
> wide_int w = real_to_integer (&fixed_value, &fail,
>@@ -1104,7 +1104,7 @@ real_convert_from_fixed (REAL_VALUE_TYPE *r,
>machine_mode mode,
> REAL_VALUE_TYPE base_value, fixed_value, real_value;
>
>signop sgn = UNSIGNED_FIXED_POINT_MODE_P (f->mode) ? UNSIGNED : SIGNED;
>- real_2expN (&base_value, GET_MODE_FBIT (f->mode), f->mode);
>+ real_2expN (&base_value, GET_MODE_FBIT (f->mode), VOIDmode);
> real_from_integer (&fixed_value, VOIDmode,
> wide_int::from (f->data, GET_MODE_PRECISION (f->mode),
> sgn), sgn);
^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-10-29 15:30 Fix real_2expN mode arguments in fixed-value.c Richard Sandiford
2015-10-29 15:47 ` Bernd Schmidt
2015-10-29 16:09 ` Richard Sandiford
2015-10-29 16:23 ` Richard Biener
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