[llvm-commits] [llvm] r171429 - in /llvm/trunk: lib/Transforms/Vectorize/LoopVectorize.cpp test/Transforms/LoopVectorize/nofloat.ll

[Nadav Rotem]

Author: nadav
Date: Wed Jan  2 17:54:43 2013
New Revision: 171429

URL: http://llvm.org/viewvc/llvm-project?rev=171429&view=rev
Log:
Avoid vectorization when the function has the "noimplicitflot" attribute.

Added:
    llvm/trunk/test/Transforms/LoopVectorize/nofloat.ll
Modified:
    llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp

Modified: llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp?rev=171429&r1=171428&r2=171429&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp (original)
+++ llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp Wed Jan  2 17:54:43 2013
@@ -94,9 +94,17 @@
     // Check the function attribues to find out if this function should be
     // optimized for size.
     Function *F = L->getHeader()->getParent();
-    Attribute::AttrKind SzAttr= Attribute::OptimizeForSize;
-    bool OptForSize =
-      F->getAttributes().hasAttribute(AttributeSet::FunctionIndex, SzAttr);
+    Attribute::AttrKind SzAttr = Attribute::OptimizeForSize;
+    Attribute::AttrKind FlAttr = Attribute::NoImplicitFloat;
+    unsigned FnIndex = AttributeSet::FunctionIndex;
+    bool OptForSize = F->getAttributes().hasAttribute(FnIndex, SzAttr);
+    bool NoFloat = F->getAttributes().hasAttribute(FnIndex, FlAttr);
+
+    if (NoFloat) {
+      DEBUG(dbgs() << "LV: Can't vectorize when the NoImplicitFloat"
+            "attribute is used.\n");
+      return false;
+    }
 
     unsigned VF = CM.selectVectorizationFactor(OptForSize, VectorizationFactor);
 

Added: llvm/trunk/test/Transforms/LoopVectorize/nofloat.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopVectorize/nofloat.ll?rev=171429&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/LoopVectorize/nofloat.ll (added)
+++ llvm/trunk/test/Transforms/LoopVectorize/nofloat.ll Wed Jan  2 17:54:43 2013
@@ -0,0 +1,29 @@
+; RUN: opt < %s  -loop-vectorize -force-vector-width=4 -dce -instcombine -licm -S | FileCheck %s
+
+; Make sure that we don't vectorize functions with 'noimplicitfloat' attributes.
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.8.0"
+
+ at a = common global [2048 x i32] zeroinitializer, align 16
+
+;CHECK: @example12
+;CHECK-NOT: store <4 x i32>
+;CHECK: ret void
+define void @example12() noimplicitfloat { ;           <--------- "noimplicitfloat" attribute here!
+  br label %1
+
+; <label>:1                                       ; preds = %1, %0
+  %indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %1 ]
+  %2 = getelementptr inbounds [2048 x i32]* @a, i64 0, i64 %indvars.iv
+  %3 = trunc i64 %indvars.iv to i32
+  store i32 %3, i32* %2, align 4
+  %indvars.iv.next = add i64 %indvars.iv, 1
+  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
+  %exitcond = icmp eq i32 %lftr.wideiv, 1024
+  br i1 %exitcond, label %4, label %1
+
+; <label>:4                                       ; preds = %1
+  ret void
+}
+