From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Sun, 17 Aug 2014 19:20:38 +0000 (+0000)
Subject: ARM: correct toggling behaviour
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=70d641fbecf2ce54fd3578890c94888fad254238

ARM: correct toggling behaviour

This was a thinko.  The intent was to flip the explicit bits that need toggling
rather than all bits.  This would result in incorrect behaviour (which now is
tested).

Thanks to Nico Weber for pointing this out!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215846 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index e4b59aedb3a..db6dfe235aa 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -9580,14 +9580,12 @@ bool ARMAsmParser::parseDirectiveArchExtension(SMLoc L) {
       return false;
     }
 
-    bool ToggleFeatures = EnableFeature
-                              ? (~STI.getFeatureBits() & Extension.Features)
-                              : ( STI.getFeatureBits() & Extension.Features);
-    if (ToggleFeatures) {
-      unsigned Features =
-          ComputeAvailableFeatures(STI.ToggleFeature(Extension.Features));
-      setAvailableFeatures(Features);
-    }
+    unsigned ToggleFeatures = EnableFeature
+                                  ? (~STI.getFeatureBits() & Extension.Features)
+                                  : ( STI.getFeatureBits() & Extension.Features);
+    unsigned Features =
+        ComputeAvailableFeatures(STI.ToggleFeature(ToggleFeatures));
+    setAvailableFeatures(Features);
     return false;
   }
 
diff --git a/test/MC/ARM/directive-arch_extension-toggle.s b/test/MC/ARM/directive-arch_extension-toggle.s
new file mode 100644
index 00000000000..c3fb901cad4
--- /dev/null
+++ b/test/MC/ARM/directive-arch_extension-toggle.s
@@ -0,0 +1,8 @@
+@ RUN: llvm-mc -triple armv7-eabi -mattr hwdiv -filetype asm -o /dev/null %s
+
+	.syntax unified
+	.thumb
+
+	udiv r0, r1, r2
+	.arch_extension idiv
+	udiv r0, r1, r2