[RewriteStatepointsForGC] All constant should have null base pointer
Currently we consider that each constant has itself as a base value. I.e "base(const) = const".
This introduces couple of problems when we are trying to avoid reporting constants in statepoint live sets:
1. When querying "base( phi(const1, const2) )" we will get "phi(const1, const2)" as a base pointer. Since
it's not a constant we will record it in a stack map. However on practice we don't want this to happen
(constant are never relocated).
2. base( phi(const, gc ptr) ) = phi( const, base(gc ptr) ). This particular case imposes challenge on our
runtime - we don't expect to see constant base pointers other than null. This problems can be avoided
by treating all constant as if they were derived from null pointer base. I.e in a first case we will
not include constant pointer in a stack map at all. In a second case we will get "phi(null, base(gc ptr))"
as a base pointer which is a lot more convenient.
Differential Revision: http://reviews.llvm.org/D20584
llvm-svn: 270993
diff --git a/llvm/test/Transforms/RewriteStatepointsForGC/base-pointers-13.ll b/llvm/test/Transforms/RewriteStatepointsForGC/base-pointers-13.ll
index 5d291af..d01c771 100644
--- a/llvm/test/Transforms/RewriteStatepointsForGC/base-pointers-13.ll
+++ b/llvm/test/Transforms/RewriteStatepointsForGC/base-pointers-13.ll
@@ -1,6 +1,6 @@
; RUN: opt < %s -rewrite-statepoints-for-gc -spp-print-base-pointers -S 2>&1 | FileCheck %s
-; CHECK: derived %derived base @global
+; CHECK: derived %derived base null
@global = external addrspace(1) global i8