[llvm-bugs] [Bug 30624] New: [META][X86] Avoid lowering C intrinsics calls to target-specific LLVM IR intrinsics

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30624

            Bug ID: 30624
           Summary: [META][X86] Avoid lowering C intrinsics calls to
                    target-specific LLVM IR intrinsics
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: zvi.rackover at intel.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17408
  --> https://llvm.org/bugs/attachment.cgi?id=17408&action=edit
List of C intrinsics that are lowered to llvm.x86.* LLVM IR intrinsics

This bug is for tracking the effort of lowering all X86 C intrinsics to
target-independent LLVM IR, for all cases that it can be done reasonably.

The attached CSV file was created by Ayman Musa. It should contain a list of
all intrinsics which are lowered to calls to llvm.x86.* intrinsics.
The list was created by parsing the Clang tests.

All intrinsics that cannot be lowered to a reasonable LLVM-IR code such that
the semantics of the original function are easy to identify at Isel, are marked
as so.

Of the 3142 intrinsics functions that appear in the CSV:
- 139 were identified as *can* be lowered to target-independent IR
- 55 were identified as *cannot* be lowered to target-independent IR
- 2948 are TBD. (Yes, lots of more work ahead of us).

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