[llvm-bugs] [Bug 49739] New: [Matrix] Support #pragma clang fp

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49739

            Bug ID: 49739
           Summary: [Matrix] Support #pragma clang fp
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: florian_hahn at apple.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Currently, `#pragma clang fp` are ignored for matrix types.

For the code below, the `contract` fast-math flag should be added to the
generated call to `llvm.matrix.multiply` and `fadd` (see also
https://godbolt.org/z/PEW8aaPoq)

typedef float fx2x2_t __attribute__((matrix_type(2, 2)));

void foo(fx2x2_t &A, fx2x2_t &C, fx2x2_t &B) {
  #pragma clang fp contract(fast)
  C = A*B + C;
}

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