https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101180
Bug ID: 101180
Summary: [12 Regression] Rejected code since
r12-299-ga0fdff3cf33f7284
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: jason at gcc dot gnu.org
Target Milestone: ---
The code is reduced from Skia (part of chromium package):
$ cat enc.ii
#pragma GCC target "avx"
template <typename> struct Simd {};
#pragma GCC push_options
#pragma GCC target "avx,avx2,bmi,bmi2,fma,f16c"
template <typename T> using Full256 = Simd<T>;
template <typename> struct BitCastFromInteger256;
template <> struct BitCastFromInteger256<float> {
__attribute__((always_inline)) float operator()(long) { return .0f; }
};
long BitCastFromByte_v_0;
template <typename T> void BitCastFromByte(Full256<T>) {
T{BitCastFromInteger256<T>()(BitCastFromByte_v_0)};
}
template <typename T, typename FromT> void BitCast(T d, FromT) {
BitCastFromByte(d);
}
int EstimateEntropy___trans_tmp_3;
void EstimateEntropy() {
Simd<float> df;
BitCast(df, EstimateEntropy___trans_tmp_3);
}
#pragma GCC pop_options
$ g++ enc.ii -c
enc.ii: In function ‘void BitCastFromByte(Full256<T>) [with T = float]’:
enc.ii:8:40: error: inlining failed in call to ‘always_inline’ ‘float
BitCastFromInteger256<float>::operator()(long int)’: target specific option
mismatch
8 | __attribute__((always_inline)) float operator()(long) { return .0f; }
| ^~~~~~~~
enc.ii:12:31: note: called from here
12 | T{BitCastFromInteger256<T>()(BitCastFromByte_v_0)};
| ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
