[llvm] 510d0e4 - [IR] Add memory attributes for init.trampoline

[Nikita Popov via llvm-commits]

Author: Nikita Popov
Date: 2021-12-23T09:00:46+01:00
New Revision: 510d0e493365386b9eb082e91d72b62fe716d32e

URL: https://github.com/llvm/llvm-project/commit/510d0e493365386b9eb082e91d72b62fe716d32e
DIFF: https://github.com/llvm/llvm-project/commit/510d0e493365386b9eb082e91d72b62fe716d32e.diff

LOG: [IR] Add memory attributes for init.trampoline

Based on my reading of https://llvm.org/docs/LangRef.html#llvm-init-trampoline-intrinsic,
init.trampoline writes to the first argument, while the other two
are readnone. These two arguments are only captured and written
into the trampoline memory. This also matches what I see in the
X86TargetLowering::LowerINIT_TRAMPOLINE() implementation.

Differential Revision: https://reviews.llvm.org/D116149

Added: 
    

Modified: 
    llvm/include/llvm/IR/Intrinsics.td

Removed: 
    


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diff  --git a/llvm/include/llvm/IR/Intrinsics.td b/llvm/include/llvm/IR/Intrinsics.td
index 138770030ebbe..acea17bc7ab87 100644
--- a/llvm/include/llvm/IR/Intrinsics.td
+++ b/llvm/include/llvm/IR/Intrinsics.td
@@ -1019,7 +1019,10 @@ def int_codeview_annotation : DefaultAttrsIntrinsic<[], [llvm_metadata_ty],
 //
 def int_init_trampoline : Intrinsic<[],
                                     [llvm_ptr_ty, llvm_ptr_ty, llvm_ptr_ty],
-                                    [IntrArgMemOnly, NoCapture<ArgIndex<0>>]>,
+                                    [IntrArgMemOnly, NoCapture<ArgIndex<0>>,
+                                     WriteOnly<ArgIndex<0>>,
+                                     ReadNone<ArgIndex<1>>,
+                                     ReadNone<ArgIndex<2>>]>,
                                     GCCBuiltin<"__builtin_init_trampoline">;
 
 def int_adjust_trampoline : Intrinsic<[llvm_ptr_ty], [llvm_ptr_ty],