[RS4GC] Fix crash in the case that a live variable has a constant base.
Summary:
Previously, RS4GC crashed in CreateGCRelocates() because it assumed
that every base is also in the array of live variables, which isn't true if a
live variable has a constant base.
This change fixes the crash by making sure CreateGCRelocates() won't try to
relocate a live variable with a constant base. This would be unnecessary
anyway because anything with a constant base won't move.
Reviewers: reames
Subscribers: llvm-commits, sanjoy
Differential Revision: http://reviews.llvm.org/D15556
llvm-svn: 256252
diff --git a/llvm/test/Transforms/RewriteStatepointsForGC/base-pointers-13.ll b/llvm/test/Transforms/RewriteStatepointsForGC/base-pointers-13.ll
new file mode 100644
index 0000000..9c16eb2
--- /dev/null
+++ b/llvm/test/Transforms/RewriteStatepointsForGC/base-pointers-13.ll
@@ -0,0 +1,19 @@
+; RUN: opt %s -rewrite-statepoints-for-gc -spp-print-base-pointers -S 2>&1 | FileCheck %s
+
+; CHECK: derived %derived base %global
+
+@global = external addrspace(1) global i8
+
+define i8 @test(i64 %offset) gc "statepoint-example" {
+ %derived = getelementptr i8, i8 addrspace(1)* @global, i64 %offset
+ %safepoint_token = call i32 (i64, i32, void ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 2882400000, i32 0, void ()* @extern, i32 0, i32 0, i32 0, i32 0)
+; CHECK-NOT: relocate
+; CHECK-NOT: remat
+; CHECK: %load = load i8, i8 addrspace(1)* %derived
+ %load = load i8, i8 addrspace(1)* %derived
+ ret i8 %load
+}
+
+declare void @extern() gc "statepoint-example"
+
+declare i32 @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i32, i32, ...)