https://bugs.llvm.org/show_bug.cgi?id=50766
Bug ID: 50766
Summary: in C double and _Float64 mist be destinct types (and
float and _Float32)
Product: clang
Version: 12.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
In C double and _Float64 are destinct types always.
In C float and _Float32 are destinct types always.
In _Float32 must NOT promote to double.
I have the definitive response from the sc22wg14 mailing list confirming
above statements.
Since the mailing list is not public I cannot sent the answer here.
x86-64 clang 12.0.0, icc 19.01 and tcc (unknown version) fail to compile
following program, but gcc 9.2.1 succeeds:
#include <stdio.h>
#include <math.h>
#define PGFN(name) _Generic((name), \
float: printf("%s():" #name "=%f\n",__func__,name), \
double: printf("%s():" #name "=%f\n",__func__,name), \
default: printf("%s():" #name "=[unknown type]\n",__func__),\
_Float32:printf("%s():" #name "=%f\n",__func__,((double)name)), \
_Float64:printf("%s():" #name "=%f\n",__func__,name) \
)
int main(int argc,char *argv[]){
float f=4.0;
double d=8.0;
_Float32 f32=32.0;
_Float64 f64=64.0;
(void)argc,(void)argv;
PGFN(f);
PGFN(d);
PGFN(f32);
PGFN(f64);
return 0;
}
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