Load from GV stub should be locally CSE'd.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55763 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 9b784b444978b438e648843b6e8e76a4c7d4e4cf..38aa994a25172c5b9b67ba680dece7d2fedc11c3 100644 (file)
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -71,6 +71,8 @@ bool X86FastISel::X86SelectConstAddr(Value *V,
     X86AddressMode AM;
     AM.GV = GV;
     addFullAddress(BuildMI(MBB, TII.get(Opc), Op0), AM);
+    // Prevent loading GV stub multiple times in same MBB.
+    LocalValueMap[V] = Op0;
   }
   return true;
 }

diff --git a/test/CodeGen/X86/fast-isel-mem.ll b/test/CodeGen/X86/fast-isel-mem.ll
new file mode 100644 (file)
index 0000000..81af0ab
--- /dev/null
+++ b/test/CodeGen/X86/fast-isel-mem.ll
@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -fast-isel -mtriple=i386-apple-darwin -mattr=sse2 | \
+; RUN:   grep mov | grep lazy_ptr | count 1
+
+@src = external global i32
+
+define i32 @loadgv() nounwind {
+entry:
+       %0 = load i32* @src, align 4
+       %1 = load i32* @src, align 4
+        %2 = add i32 %0, %1
+       ret i32 %2
+}

diff --git a/test/CodeGen/X86/fast-isel.ll b/test/CodeGen/X86/fast-isel.ll
index 10b2e1ee42a470bd6373700eb84d734d42770767..9910629211e5689bc0aa63eb2629e141ac839827 100644 (file)
--- a/test/CodeGen/X86/fast-isel.ll
+++ b/test/CodeGen/X86/fast-isel.ll
@@ -47,11 +47,3 @@ entry:
        %tmp2 = bitcast i32 0 to i32
        ret i32 %tmp2
 }
-
-@src = external global i32
-
-define i32 @loadgv() nounwind {
-entry:
-       %0 = load i32* @src, align 4
-       ret i32 %0
-}