Teach ConstantFoldInstruction() how to fold insertvalue and extractvalue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120316 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/ConstantFolding.cpp

@@ -740,7 +740,18 @@ Constant *llvm::ConstantFoldInstruction(Instruction *I, const TargetData *TD) {
   
   if (const LoadInst *LI = dyn_cast<LoadInst>(I))
     return ConstantFoldLoadInst(LI, TD);
-  
+
+  if (InsertValueInst *IVI = dyn_cast<InsertValueInst>(I))
+    return ConstantExpr::getInsertValue(
+                                cast<Constant>(IVI->getAggregateOperand()),
+                                cast<Constant>(IVI->getInsertedValueOperand()),
+                                IVI->idx_begin(), IVI->getNumIndices());
+
+  if (ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(I))
+    return ConstantExpr::getExtractValue(
+                                    cast<Constant>(EVI->getAggregateOperand()),
+                                    EVI->idx_begin(), EVI->getNumIndices());
+
   return ConstantFoldInstOperands(I->getOpcode(), I->getType(),
                                   Ops.data(), Ops.size(), TD);
 }

test/Transforms/ConstProp/extractvalue.ll

@@ -0,0 +1,68 @@
+; RUN: opt < %s -constprop -S | FileCheck %s
+
+%struct = type { i32, [4 x i8] }
+%array = type [3 x %struct]
+
+define i32 @test1() {
+  %A = extractvalue %struct { i32 2, [4 x i8] c"foo\00" }, 0
+  ret i32 %A
+; CHECK: @test1
+; CHECK: ret i32 2
+}
+
+define i8 @test2() {
+  %A = extractvalue %struct { i32 2, [4 x i8] c"foo\00" }, 1, 2
+  ret i8 %A
+; CHECK: @test2
+; CHECK: ret i8 111
+}
+
+define i32 @test3() {
+  %A = extractvalue %array [ %struct { i32 0, [4 x i8] c"aaaa" }, %struct { i32 1, [4 x i8] c"bbbb" }, %struct { i32 2, [4 x i8] c"cccc" } ], 1, 0
+  ret i32 %A
+; CHECK: @test3
+; CHECK: ret i32 1
+}
+
+define i32 @zeroinitializer-test1() {
+  %A = extractvalue %struct zeroinitializer, 0
+  ret i32 %A
+; CHECK: @zeroinitializer-test1
+; CHECK: ret i32 0
+}
+
+define i8 @zeroinitializer-test2() {
+  %A = extractvalue %struct zeroinitializer, 1, 2
+  ret i8 %A
+; CHECK: @zeroinitializer-test2
+; CHECK: ret i8 0
+}
+
+define i32 @zeroinitializer-test3() {
+  %A = extractvalue %array zeroinitializer, 1, 0
+  ret i32 %A
+; CHECK: @zeroinitializer-test3
+; CHECK: ret i32 0
+}
+
+define i32 @undef-test1() {
+  %A = extractvalue %struct undef, 0
+  ret i32 %A
+; CHECK: @undef-test1
+; CHECK: ret i32 undef
+}
+
+define i8 @undef-test2() {
+  %A = extractvalue %struct undef, 1, 2
+  ret i8 %A
+; CHECK: @undef-test2
+; CHECK: ret i8 undef
+}
+
+define i32 @undef-test3() {
+  %A = extractvalue %array undef, 1, 0
+  ret i32 %A
+; CHECK: @undef-test3
+; CHECK: ret i32 undef
+}
+

test/Transforms/ConstProp/insertvalue.ll

@@ -0,0 +1,68 @@
+; RUN: opt < %s -constprop -S | FileCheck %s
+
+%struct = type { i32, [4 x i8] }
+%array = type [3 x %struct]
+
+define %struct @test1() {
+  %A = insertvalue %struct { i32 2, [4 x i8] c"foo\00" }, i32 1, 0
+  ret %struct %A
+; CHECK: @test1
+; CHECK: ret %struct { i32 1, [4 x i8] c"foo\00" }
+}
+
+define %struct @test2() {
+  %A = insertvalue %struct { i32 2, [4 x i8] c"foo\00" }, i8 1, 1, 2
+  ret %struct %A
+; CHECK: @test2
+; CHECK: ret %struct { i32 2, [4 x i8] c"fo\01\00" }
+}
+
+define %array @test3() {
+  %A = insertvalue %array [ %struct { i32 0, [4 x i8] c"aaaa" }, %struct { i32 1, [4 x i8] c"bbbb" }, %struct { i32 2, [4 x i8] c"cccc" } ], i32 -1, 1, 0
+  ret %array %A
+; CHECK: @test3
+; CHECK:ret %array [%struct { i32 0, [4 x i8] c"aaaa" }, %struct { i32 -1, [4 x i8] c"bbbb" }, %struct { i32 2, [4 x i8] c"cccc" }]
+}
+
+define %struct @zeroinitializer-test1() {
+  %A = insertvalue %struct zeroinitializer, i32 1, 0
+  ret %struct %A
+; CHECK: @zeroinitializer-test1
+; CHECK: ret %struct { i32 1, [4 x i8] zeroinitializer }
+}
+
+define %struct @zeroinitializer-test2() {
+  %A = insertvalue %struct zeroinitializer, i8 1, 1, 2
+  ret %struct %A
+; CHECK: @zeroinitializer-test2
+; CHECK: ret %struct { i32 0, [4 x i8] c"\00\00\01\00" }
+}
+
+define %array @zeroinitializer-test3() {
+  %A = insertvalue %array zeroinitializer, i32 1, 1, 0
+  ret %array %A
+; CHECK: @zeroinitializer-test3
+; CHECK: ret %array [%struct zeroinitializer, %struct { i32 1, [4 x i8] zeroinitializer }, %struct zeroinitializer]
+}
+
+define %struct @undef-test1() {
+  %A = insertvalue %struct undef, i32 1, 0
+  ret %struct %A
+; CHECK: @undef-test1
+; CHECK: ret %struct { i32 1, [4 x i8] undef }
+}
+
+define %struct @undef-test2() {
+  %A = insertvalue %struct undef, i8 0, 1, 2
+  ret %struct %A
+; CHECK: @undef-test2
+; CHECK: ret %struct { i32 undef, [4 x i8] [i8 undef, i8 undef, i8 0, i8 undef] }
+}
+
+define %array @undef-test3() {
+  %A = insertvalue %array undef, i32 0, 1, 0
+  ret %array %A
+; CHECK: @undef-test3
+; CHECK: ret %array [%struct undef, %struct { i32 0, [4 x i8] undef }, %struct undef]
+}
+