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* [gcc r13-3507] i386: add reset_cpu_feature
@ 2022-10-26 10:49 Martin Liska
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From: Martin Liska @ 2022-10-26 10:49 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:d80b7744c6ae6f6d8ca1f56982a50d1888b8279f
commit r13-3507-gd80b7744c6ae6f6d8ca1f56982a50d1888b8279f
Author: Martin Liska <mliska@suse.cz>
Date: Tue Oct 25 06:28:44 2022 +0200
i386: add reset_cpu_feature
gcc/ChangeLog:
* common/config/i386/cpuinfo.h (has_cpu_feature): Add comment.
(reset_cpu_feature): New.
(get_zhaoxin_cpu): Use reset_cpu_feature.
Diff:
---
gcc/common/config/i386/cpuinfo.h | 38 +++++++++++++++++++++++++++++++++-----
1 file changed, 33 insertions(+), 5 deletions(-)
diff --git a/gcc/common/config/i386/cpuinfo.h b/gcc/common/config/i386/cpuinfo.h
index d45451c5704..19ea7132fd5 100644
--- a/gcc/common/config/i386/cpuinfo.h
+++ b/gcc/common/config/i386/cpuinfo.h
@@ -76,6 +76,8 @@ has_cpu_feature (struct __processor_model *cpu_model,
}
}
+/* Save FEATURE to either CPU_MODEL or CPU_FEATURES2. */
+
static inline void
set_cpu_feature (struct __processor_model *cpu_model,
unsigned int *cpu_features2,
@@ -100,6 +102,32 @@ set_cpu_feature (struct __processor_model *cpu_model,
}
}
+/* Drop FEATURE from either CPU_MODEL or CPU_FEATURES2. */
+
+static inline void
+reset_cpu_feature (struct __processor_model *cpu_model,
+ unsigned int *cpu_features2,
+ enum processor_features feature)
+{
+ unsigned index, offset;
+ unsigned f = feature;
+
+ if (f < 32)
+ {
+ /* The first 32 features. */
+ cpu_model->__cpu_features[0] &= ~(1U << f);
+ }
+ else
+ {
+ /* The rest of features. cpu_features2[i] contains features from
+ (32 + i * 32) to (31 + 32 + i * 32), inclusively. */
+ f -= 32;
+ index = f / 32;
+ offset = f % 32;
+ cpu_features2[index] &= ~(1U << offset);
+ }
+}
+
/* Get the specific type of AMD CPU and return AMD CPU name. Return
NULL for unknown AMD CPU. */
@@ -565,11 +593,11 @@ get_zhaoxin_cpu (struct __processor_model *cpu_model,
cpu_model->__cpu_type = ZHAOXIN_FAM7H;
if (model == 0x3b)
{
- cpu = "lujiazui";
- CHECK___builtin_cpu_is ("lujiazui");
- cpu_model->__cpu_features[0] &= ~(1U <<(FEATURE_AVX & 31));
- cpu_features2[0] &= ~(1U <<((FEATURE_F16C - 32) & 31));
- cpu_model->__cpu_subtype = ZHAOXIN_FAM7H_LUJIAZUI;
+ cpu = "lujiazui";
+ CHECK___builtin_cpu_is ("lujiazui");
+ reset_cpu_feature (cpu_model, cpu_features2, FEATURE_AVX);
+ reset_cpu_feature (cpu_model, cpu_features2, FEATURE_F16C);
+ cpu_model->__cpu_subtype = ZHAOXIN_FAM7H_LUJIAZUI;
}
break;
default:
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