https://bugs.llvm.org/show_bug.cgi?id=44684
Bug ID: 44684
Summary: __builtin calls that would have produced integer
constants expressions on their own do not produce
integer constant when the builtin call is composed
across a _Generic selection
Product: clang
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: psko...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
These all fail on clang while succeeding on gcc:
_Static_assert(_Generic(1u,unsigned:__builtin_clz)(1u),""); //✗
_Static_assert(_Generic(1u,unsigned:__builtin_popcount)(1u),""); //✗
_Static_assert(_Generic(1u,unsigned:__builtin_ctz)(2u),""); //✗
(Both gcc and clang successfully compile:
_Static_assert(__builtin_clz(1u),""); //✓
_Static_assert(__builtin_popcount(1u),""); //✓
_Static_assert(__builtin_ctz(2u),""); //✓
)
https://gcc.godbolt.org/z/_CpbSL
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