rmuir commented on a change in pull request #69:
URL: https://github.com/apache/lucene/pull/69#discussion_r608759137
##########
File path: lucene/core/src/java/org/apache/lucene/codecs/lucene90/PForUtil.java
##########
@@ -121,4 +167,146 @@ void skip(DataInput in) throws IOException {
in.skipBytes(forUtil.numBytes(bitsPerValue) + (numExceptions << 1));
}
}
+
+ /**
+ * Fill {@code longs} with the final values for the case of all deltas being
1. Note this assumes
+ * there are no exceptions to apply.
+ */
+ private static void prefixSumOfOnes(long[] longs, long base) {
+ System.arraycopy(IDENTITY_PLUS_ONE, 0, longs, 0, ForUtil.BLOCK_SIZE);
+ // This loop gets auto-vectorized
+ for (int i = 0; i < ForUtil.BLOCK_SIZE; ++i) {
+ longs[i] += base;
+ }
+ }
+
+ /**
+ * Fill {@code longs} with the final values for the case of all deltas being
{@code val}. Note
+ * this assumes there are no exceptions to apply.
+ */
+ private static void prefixSumOf(long[] longs, long base, long val) {
+ for (int i = 0; i < ForUtil.BLOCK_SIZE; i++) {
+ longs[i] = (i + 1) * val + base;
Review comment:
here's my notes for building the shared library from last time i
recently did this (may be incomplete, sorry):
```
$ git clone [email protected]:openjdk/jdk.git
$ cd jdk/src/utils/hsdis/build
$ curl -fLO https://ftp.gnu.org/gnu/binutils/binutils-2.36.tar.gz
$ gzip -dc binutils-2.36.tar.gz | tar -xvf -
$ mv binutils-2.36 binutils
$ cd ..
$ make ARCH=amd64
```
This will create build/linux-amd64/hsdis-amd64.so
For me it initially fails because of binutils enabling `-Werror` (i have a
newer gcc), so i had to hack the Makefile for it to really work:
```
--- a/src/utils/hsdis/Makefile
+++ b/src/utils/hsdis/Makefile
@@ -192,7 +192,7 @@ $(LIBRARIES): $(TARGET_DIR) $(TARGET_DIR)/Makefile
if [ ! -f $@ ]; then cd $(TARGET_DIR); make all-opcodes; fi
$(TARGET_DIR)/Makefile:
- (cd $(TARGET_DIR); CC=$(CC) CFLAGS="$(CFLAGS)" AR="$(AR)"
$(BINUTILSDIR)/configure --disable-nls $(CONFIGURE_ARGS))
+ (cd $(TARGET_DIR); CC=$(CC) CFLAGS="$(CFLAGS)" AR="$(AR)"
$(BINUTILSDIR)/configure --disable-werror --disable-nls $(CONFIGURE_ARGS))
```
Now you can print assembly generated from the JIT, but you need to ensure
the code is really fully C2-compiled so that you are looking at the correct
stuff, etc.... essentially target the code in question and heat it up. So I use
JMH for that, they have instructions in the repo: https://github.com/openjdk/jmh
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