[SDAGBuilder] Don't create a binary tree for switches in minsize mode
This bloats codesize - all of the non-leaf nodes are extra code.
llvm-svn: 280932
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index e037108..5e9bc0d 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -9237,7 +9237,8 @@
WorkList.pop_back();
unsigned NumClusters = W.LastCluster - W.FirstCluster + 1;
- if (NumClusters > 3 && TM.getOptLevel() != CodeGenOpt::None) {
+ if (NumClusters > 3 && TM.getOptLevel() != CodeGenOpt::None &&
+ !DefaultMBB->getParent()->getFunction()->optForMinSize()) {
// For optimized builds, lower large range as a balanced binary tree.
splitWorkItem(WorkList, W, SI.getCondition(), SwitchMBB);
continue;
diff --git a/llvm/test/CodeGen/ARM/switch-minsize.ll b/llvm/test/CodeGen/ARM/switch-minsize.ll
new file mode 100644
index 0000000..92af6b3
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/switch-minsize.ll
@@ -0,0 +1,34 @@
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
+target triple = "thumbv7-apple-ios8.0.0"
+
+; CHECK: beq
+; CHECK: beq
+; CHECK: beq
+; CHECK: cbnz
+declare void @g(i32)
+define void @f(i32 %val) optsize minsize {
+ switch i32 %val, label %def [
+ i32 0, label %one
+ i32 9, label %two
+ i32 994, label %three
+ i32 1154, label %four
+ ]
+
+one:
+ call void @g(i32 1)
+ ret void
+two:
+ call void @g(i32 001)
+ ret void
+three:
+ call void @g(i32 78)
+ ret void
+four:
+ call void @g(i32 87)
+ ret void
+def:
+ call void @g(i32 11)
+ ret void
+}