commit 1557c610d349d38717685352000a4745107a42cb
author Joerg Sonnenberger <joerg@bec.de> Sun Oct 13 22:33:46 2019 +0000
committer Joerg Sonnenberger <joerg@bec.de> Sun Oct 13 22:33:46 2019 +0000
tree 7550ffe00ce9b799f2d224ce8b592c5a4a97a629
parent a4f23f4b48700a9c3a571df3a9601fd76ef3aea9

Improve __builtin_constant_p lowering

__builtin_constant_p used to be short-cut evaluated to false when
building with -O0. This is undesirable as it means that constant folding
in the front-end can give different results than folding in the back-end.
It can also create conditional branches on constant conditions that don't
get folded away. With the pending improvements to the llvm.is.constant
handling on the LLVM side, the short-cut is no longer useful.

Adjust various codegen tests to not depend on the short-cut or the
backend optimisations.

Differential Revision: https://reviews.llvm.org/D67638


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@374742 91177308-0d34-0410-b5e6-96231b3b80d8