[APInt] Use memset in setAllBits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298867 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ADT/APInt.h b/include/llvm/ADT/APInt.h
index c407d9c55a285ae5d833a9540579b4b5806f26ef..220e408da15d9c8e3379857bcb54f5b9b828a6e0 100644 (file)
--- a/include/llvm/ADT/APInt.h
+++ b/include/llvm/ADT/APInt.h
@@ -1164,11 +1164,9 @@ public:
   void setAllBits() {
     if (isSingleWord())
       VAL = UINT64_MAX;
-    else {
+    else
       // Set all the bits in all the words.
-      for (unsigned i = 0; i < getNumWords(); ++i)
-        pVal[i] = UINT64_MAX;
-    }
+      memset(pVal, -1, getNumWords() * APINT_WORD_SIZE);
     // Clear the unused ones
     clearUnusedBits();
   }

diff --git a/unittests/ADT/APIntTest.cpp b/unittests/ADT/APIntTest.cpp
index f58d1fee45f71ad3985f6bd8dcfc2d0c0caff700..2148d4fd7e5919867856d0d412c6892a5e797cca 100644 (file)
--- a/unittests/ADT/APIntTest.cpp
+++ b/unittests/ADT/APIntTest.cpp
@@ -1895,3 +1895,41 @@ TEST(APIntTest, setBitsFrom) {
   EXPECT_EQ(0u, i64from63.countTrailingOnes());
   EXPECT_EQ(1u, i64from63.countPopulation());
 }
+
+TEST(APIntTest, setAllBits) {
+  APInt i32(32, 0);
+  i32.setAllBits();
+  EXPECT_EQ(32u, i32.countLeadingOnes());
+  EXPECT_EQ(0u, i32.countLeadingZeros());
+  EXPECT_EQ(32u, i32.getActiveBits());
+  EXPECT_EQ(0u, i32.countTrailingZeros());
+  EXPECT_EQ(32u, i32.countTrailingOnes());
+  EXPECT_EQ(32u, i32.countPopulation());
+
+  APInt i64(64, 0);
+  i64.setAllBits();
+  EXPECT_EQ(64u, i64.countLeadingOnes());
+  EXPECT_EQ(0u, i64.countLeadingZeros());
+  EXPECT_EQ(64u, i64.getActiveBits());
+  EXPECT_EQ(0u, i64.countTrailingZeros());
+  EXPECT_EQ(64u, i64.countTrailingOnes());
+  EXPECT_EQ(64u, i64.countPopulation());
+
+  APInt i96(96, 0);
+  i96.setAllBits();
+  EXPECT_EQ(96u, i96.countLeadingOnes());
+  EXPECT_EQ(0u, i96.countLeadingZeros());
+  EXPECT_EQ(96u, i96.getActiveBits());
+  EXPECT_EQ(0u, i96.countTrailingZeros());
+  EXPECT_EQ(96u, i96.countTrailingOnes());
+  EXPECT_EQ(96u, i96.countPopulation());
+
+  APInt i128(128, 0);
+  i128.setAllBits();
+  EXPECT_EQ(128u, i128.countLeadingOnes());
+  EXPECT_EQ(0u, i128.countLeadingZeros());
+  EXPECT_EQ(128u, i128.getActiveBits());
+  EXPECT_EQ(0u, i128.countTrailingZeros());
+  EXPECT_EQ(128u, i128.countTrailingOnes());
+  EXPECT_EQ(128u, i128.countPopulation());
+}