From 82d91ddb4f3a8f44166cde07af47217fcc3023fb Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Tue, 11 Aug 2015 19:39:36 +0000
Subject: [PATCH] fix minsize detection: minsize attribute implies optimizing
 for size

Also, add a test for optsize because this was not part of any existing regression test.

llvm-svn: 244651
---
 llvm/lib/CodeGen/CodeGenPrepare.cpp |  3 +--
 llvm/test/CodeGen/X86/slow-div.ll   | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 3768807..9e0ac96 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -214,8 +214,7 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
     TLI = TM->getSubtargetImpl(F)->getTargetLowering();
   TLInfo = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
   TTI = &getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
-  // FIXME: Use Function::optForSize().
-  OptSize = F.hasFnAttribute(Attribute::OptimizeForSize);
+  OptSize = F.optForSize();
 
   /// This optimization identifies DIV instructions that can be
   /// profitably bypassed and carried out with a shorter, faster divide.
diff --git a/llvm/test/CodeGen/X86/slow-div.ll b/llvm/test/CodeGen/X86/slow-div.ll
index 5222382..8292852 100644
--- a/llvm/test/CodeGen/X86/slow-div.ll
+++ b/llvm/test/CodeGen/X86/slow-div.ll
@@ -25,4 +25,19 @@ entry:
   ret i64 %div
 }
 
+; Verify that no extra code is generated when optimizing for size.
+
+define i32 @div32_optsize(i32 %a, i32 %b) optsize {
+; DIV32-LABEL: div32_optsize:
+; DIV32-NOT: divb
+  %div = sdiv i32 %a, %b
+  ret i32 %div
+}
+
+define i32 @div32_minsize(i32 %a, i32 %b) minsize {
+; DIV32-LABEL: div32_minsize:
+; DIV32-NOT: divb
+  %div = sdiv i32 %a, %b
+  ret i32 %div
+}
 
-- 
2.7.4