From: Duncan Sands <baldrick@free.fr>
Date: Fri, 9 Sep 2011 07:50:37 +0000 (+0000)
Subject: Mark the eh.typeid.for intrinsic as being 'const', which it is inside
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=73c8415d90ad5a702538d8bc308411e7b2299f32;p=oota-llvm.git

Mark the eh.typeid.for intrinsic as being 'const', which it is inside
any given function.  As pointed out by John McCall, this is needed to
have redundant eh.typeid.for tests be eliminated in the presence of
cleanups.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139360 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/llvm/Intrinsics.td b/include/llvm/Intrinsics.td
index b7b4e7cc06c..c526301bf91 100644
--- a/include/llvm/Intrinsics.td
+++ b/include/llvm/Intrinsics.td
@@ -309,7 +309,9 @@ def int_eh_selector  : Intrinsic<[llvm_i32_ty],
                                  [llvm_ptr_ty, llvm_ptr_ty, llvm_vararg_ty]>;
 def int_eh_resume    : Intrinsic<[], [llvm_ptr_ty, llvm_i32_ty], [Throws]>;
 
-def int_eh_typeid_for : Intrinsic<[llvm_i32_ty], [llvm_ptr_ty], [IntrReadMem]>;
+// The result of eh.typeid.for depends on the enclosing function, but inside a
+// given function it is 'const' and may be CSE'd etc.
+def int_eh_typeid_for : Intrinsic<[llvm_i32_ty], [llvm_ptr_ty], [IntrNoMem]>;
 
 def int_eh_return_i32 : Intrinsic<[], [llvm_i32_ty, llvm_ptr_ty]>;
 def int_eh_return_i64 : Intrinsic<[], [llvm_i64_ty, llvm_ptr_ty]>;
diff --git a/test/Transforms/GVN/2011-09-07-TypeIdFor.ll b/test/Transforms/GVN/2011-09-07-TypeIdFor.ll
index eeaf998e72c..314b5bb113a 100644
--- a/test/Transforms/GVN/2011-09-07-TypeIdFor.ll
+++ b/test/Transforms/GVN/2011-09-07-TypeIdFor.ll
@@ -7,6 +7,8 @@
 
 declare void @_Z4barv()
 
+declare void @_Z7cleanupv()
+
 declare i32 @llvm.eh.typeid.for(i8*) nounwind readonly
 
 declare i8* @__cxa_begin_catch(i8*) nounwind
@@ -50,6 +52,7 @@ ppad2:                                            ; preds = %next
   br label %return
 
 next2:                                            ; preds = %next
+  call void @_Z7cleanupv()
   %typeid = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%struct.__fundamental_type_info_pseudo* @_ZTIi to i8*))
 ; CHECK-NOT: call i32 @llvm.eh.typeid.for
   %4 = icmp eq i32 %filter3.i, %typeid