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

2 files changed, 16 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 3768807702b..9e0ac96ba56 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 52223824bf9..82928521ac2 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
+}