Make sure short memsets on ARM lower to stores, even when optimizing for size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143055 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 472bf4c42f3de0b9283f1a1e73cfaed852f5003b..31e522d4d70a61a80ae628e86a53f40c310a6eee 100644 (file)
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -752,6 +752,8 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
 
   //// temporary - rewrite interface to use type
   maxStoresPerMemcpy = maxStoresPerMemcpyOptSize = 1;
+  maxStoresPerMemset = 16;
+  maxStoresPerMemsetOptSize = Subtarget->isTargetDarwin() ? 8 : 4;
 
   // On ARM arguments smaller than 4 bytes are extended, so all arguments
   // are at least 4 bytes aligned.

diff --git a/test/CodeGen/ARM/2011-10-26-memset-inline.ll b/test/CodeGen/ARM/2011-10-26-memset-inline.ll
new file mode 100644 (file)
index 0000000..a236ffe
--- /dev/null
+++ b/test/CodeGen/ARM/2011-10-26-memset-inline.ll
@@ -0,0 +1,18 @@
+; Make sure short memsets on ARM lower to stores, even when optimizing for size.
+; RUN: llc -march=arm < %s | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"
+target triple = "thumbv7-apple-ios5.0.0"
+
+; CHECK:      strb
+; CHECK-NEXT: strb
+; CHECK-NEXT: strb
+; CHECK-NEXT: strb
+; CHECK-NEXT: strb 
+define void @foo(i8* nocapture %c) nounwind optsize {
+entry:
+  call void @llvm.memset.p0i8.i64(i8* %c, i8 -1, i64 5, i32 1, i1 false)
+  ret void
+}
+
+declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind