[all-commits] [llvm/llvm-project] 7fac1a: Set the LLVM FP optimization flags conservatively.

[John McCall via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 7fac1acc617113b7a3276ee0f0664bedca978292
      https://github.com/llvm/llvm-project/commit/7fac1acc617113b7a3276ee0f0664bedca978292
  Author: John McCall <rjmccall at apple.com>
  Date:   2020-06-11 (Thu, 11 Jun 2020)

  Changed paths:
    M clang/include/clang/Basic/LangOptions.h
    M clang/lib/CodeGen/CGExprScalar.cpp
    M clang/lib/CodeGen/CodeGenFunction.cpp
    M clang/lib/CodeGen/CodeGenFunction.h
    A clang/test/CodeGen/fp-function-attrs.cpp

  Log Message:
  -----------
  Set the LLVM FP optimization flags conservatively.

Functions can have local pragmas that override the global settings.
We set the flags eagerly based on global settings, but if we emit
an expression under the influence of a pragma, we clear the
appropriate flags from the function.

In order to avoid doing a ton of redundant work whenever we emit
an FP expression, configure the IRBuilder to default to global
settings, and only reconfigure it when we see an FP expression
that's not using the global settings.

Patch by Michele Scandale!

https://reviews.llvm.org/D80462