https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91792
Bug ID: 91792
Summary: [9 Regression] constexpr ++ or -- evaluation fails on
float or double
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: cyp561 at gmail dot com
Target Milestone: ---
According to https://godbolt.org/z/XzT1wz, compiles in 8.3 and trunk. Fails
compilation on 9.2.
constexpr float f() { float x = 42; ++x; return x; }
void g() { constexpr float x = f(); }
<source>: In function 'void g()':
<source>:2:33: in 'constexpr' expansion of 'f()'
<source>:2:34: error: '((float)1 + 4.2e+1f)' is not a constant expression
2 | void g() { constexpr float x = f(); }
| ^
