Implement fp to bits methods as intrinsics.
Rationale:
Better optimization, better performance.
Results on libcore benchmark:
Most gain is from moving the invariant call out of the loop
after we detect everything is a side-effect free intrinsic.
But generated code in general case is much cleaner too.
Before:
timeFloatToIntBits() in 181 ms.
timeFloatToRawIntBits() in 35 ms.
timeDoubleToLongBits() in 208 ms.
timeDoubleToRawLongBits() in 35 ms.
After:
timeFloatToIntBits() in 36 ms.
timeFloatToRawIntBits() in 35 ms.
timeDoubleToLongBits() in 35 ms.
timeDoubleToRawLongBits() in 34 ms.
bug=11548336
Change-Id: I6e001bd3708e800bd75a82b8950fb3a0fc01766e
diff --git a/test/577-checker-fp2int/src/Main.java b/test/577-checker-fp2int/src/Main.java
new file mode 100644
index 0000000..e3f1230
--- /dev/null
+++ b/test/577-checker-fp2int/src/Main.java
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+public class Main {
+
+ /// CHECK-START: int Main.f2int(float) instruction_simplifier (before)
+ /// CHECK-DAG: <<Result:i\d+>> InvokeStaticOrDirect intrinsic:FloatFloatToIntBits
+ /// CHECK-DAG: Return [<<Result>>]
+ //
+ /// CHECK-START: int Main.f2int(float) instruction_simplifier (after)
+ /// CHECK-DAG: <<Raw:i\d+>> InvokeStaticOrDirect [<<Arg:f\d+>>] intrinsic:FloatFloatToRawIntBits
+ /// CHECK-DAG: <<Cond:z\d+>> NotEqual [<<Arg>>,<<Arg>>]
+ /// CHECK-DAG: <<Result:i\d+>> Select [<<Raw>>,{{i\d+}},<<Cond>>]
+ /// CHECK-DAG: Return [<<Result>>]
+ private static int f2int(float f) {
+ return Float.floatToIntBits(f);
+ }
+
+ /// CHECK-START: long Main.d2long(double) instruction_simplifier (before)
+ /// CHECK-DAG: <<Result:j\d+>> InvokeStaticOrDirect intrinsic:DoubleDoubleToLongBits
+ /// CHECK-DAG: Return [<<Result>>]
+ //
+ /// CHECK-START: long Main.d2long(double) instruction_simplifier (after)
+ /// CHECK-DAG: <<Raw:j\d+>> InvokeStaticOrDirect [<<Arg:d\d+>>] intrinsic:DoubleDoubleToRawLongBits
+ /// CHECK-DAG: <<Cond:z\d+>> NotEqual [<<Arg>>,<<Arg>>]
+ /// CHECK-DAG: <<Result:j\d+>> Select [<<Raw>>,{{j\d+}},<<Cond>>]
+ /// CHECK-DAG: Return [<<Result>>]
+ private static long d2long(double d) {
+ return Double.doubleToLongBits(d);
+ }
+
+ public static void main(String args[]) {
+ // A few distinct numbers.
+ expectEquals32(0xff800000, f2int(Float.NEGATIVE_INFINITY));
+ expectEquals32(0xbf800000, f2int(-1.0f));
+ expectEquals32(0x80000000, f2int(-0.0f));
+ expectEquals32(0x00000000, f2int(+0.0f));
+ expectEquals32(0x3f800000, f2int(+1.0f));
+ expectEquals32(0x7f800000, f2int(Float.POSITIVE_INFINITY));
+
+ // A few others.
+ for (int i = 0; i <= 100; i++) {
+ expectEquals32(i, f2int(Float.intBitsToFloat(i)));
+ }
+
+ // A few NaN numbers.
+ float[] fvals = {
+ Float.intBitsToFloat(0x7f800001),
+ Float.intBitsToFloat(0x7fa00000),
+ Float.intBitsToFloat(0x7fc00000),
+ Float.intBitsToFloat(0x7fffffff),
+ Float.intBitsToFloat(0xff800001),
+ Float.intBitsToFloat(0xffa00000),
+ Float.intBitsToFloat(0xffc00000),
+ Float.intBitsToFloat(0xffffffff)
+ };
+ for (int i = 0; i < fvals.length; i++) {
+ expectEquals32(0x7fc00000, f2int(fvals[i]));
+ }
+
+ // A few distinct numbers.
+ expectEquals64(0xfff0000000000000L, d2long(Double.NEGATIVE_INFINITY));
+ expectEquals64(0xbff0000000000000L, d2long(-1.0d));
+ expectEquals64(0x8000000000000000L, d2long(-0.0d));
+ expectEquals64(0x0000000000000000L, d2long(+0.0d));
+ expectEquals64(0x3ff0000000000000L, d2long(+1.0d));
+ expectEquals64(0x7ff0000000000000L, d2long(Double.POSITIVE_INFINITY));
+
+ // A few others.
+ for (long l = 0; l <= 100; l++) {
+ expectEquals64(l, d2long(Double.longBitsToDouble(l)));
+ }
+
+ // A few NaN numbers.
+ double[] dvals = {
+ Double.longBitsToDouble(0x7ff0000000000001L),
+ Double.longBitsToDouble(0x7ff4000000000000L),
+ Double.longBitsToDouble(0x7ff8000000000000L),
+ Double.longBitsToDouble(0x7fffffffffffffffL),
+ Double.longBitsToDouble(0xfff0000000000001L),
+ Double.longBitsToDouble(0xfff4000000000000L),
+ Double.longBitsToDouble(0xfff8000000000000L),
+ Double.longBitsToDouble(0xffffffffffffffffL)
+ };
+ for (int i = 0; i < dvals.length; i++) {
+ expectEquals64(0x7ff8000000000000L, d2long(dvals[i]));
+ }
+
+ System.out.println("passed");
+ }
+
+ private static void expectEquals32(int expected, int result) {
+ if (expected != result) {
+ throw new Error("Expected: "
+ + Integer.toHexString(expected)
+ + ", found: "
+ + Integer.toHexString(result));
+ }
+ }
+
+ private static void expectEquals64(long expected, long result) {
+ if (expected != result) {
+ throw new Error("Expected: "
+ + Long.toHexString(expected)
+ + ", found: "
+ + Long.toHexString(result));
+ }
+ }
+}