[llvm] r213000 - Look through addrspacecast in IsConstantOffsetFromGlobal

Matt Arsenault Matthew.Arsenault at amd.com
Mon Jul 14 15:39:26 PDT 2014


Author: arsenm
Date: Mon Jul 14 17:39:26 2014
New Revision: 213000

URL: http://llvm.org/viewvc/llvm-project?rev=213000&view=rev
Log:
Look through addrspacecast in IsConstantOffsetFromGlobal

Modified:
    llvm/trunk/lib/Analysis/ConstantFolding.cpp
    llvm/trunk/test/Transforms/ConstProp/loads.ll

Modified: llvm/trunk/lib/Analysis/ConstantFolding.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ConstantFolding.cpp?rev=213000&r1=212999&r2=213000&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/ConstantFolding.cpp (original)
+++ llvm/trunk/lib/Analysis/ConstantFolding.cpp Mon Jul 14 17:39:26 2014
@@ -240,7 +240,8 @@ static bool IsConstantOffsetFromGlobal(C
 
   // Look through ptr->int and ptr->ptr casts.
   if (CE->getOpcode() == Instruction::PtrToInt ||
-      CE->getOpcode() == Instruction::BitCast)
+      CE->getOpcode() == Instruction::BitCast ||
+      CE->getOpcode() == Instruction::AddrSpaceCast)
     return IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD);
 
   // i32* getelementptr ([5 x i32]* @a, i32 0, i32 5)

Modified: llvm/trunk/test/Transforms/ConstProp/loads.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/ConstProp/loads.ll?rev=213000&r1=212999&r2=213000&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/ConstProp/loads.ll (original)
+++ llvm/trunk/test/Transforms/ConstProp/loads.ll Mon Jul 14 17:39:26 2014
@@ -36,6 +36,19 @@ define i16 @test2() {
 ; BE: ret i16 -8531
 }
 
+define i16 @test2_addrspacecast() {
+  %r = load i16 addrspace(1)* addrspacecast(i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16 addrspace(1)*)
+  ret i16 %r
+
+; 0xBEEF
+; LE-LABEL: @test2_addrspacecast(
+; LE: ret i16 -16657
+
+; 0xDEAD
+; BE-LABEL: @test2_addrspacecast(
+; BE: ret i16 -8531
+}
+
 ; Load of second 16 bits of 32-bit value.
 define i16 @test3() {
   %r = load i16* getelementptr(i16* bitcast(i32* getelementptr ({{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*), i32 1)





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