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8248870: AARCH64: I2L/L2I conversions can be skipped for masked positive values

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Reviewed-by: aph
This commit is contained in:
Boris Ulasevich 2020-07-24 08:21:11 -04:00
parent f79b7e62db
commit 4a1d4be729
3 changed files with 40 additions and 0 deletions
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15
src/hotspot/cpu/aarch64/aarch64.ad
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@ -12171,6 +12171,21 @@ instruct ubfizIConvI2L(iRegLNoSp dst, iRegIorL2I src, immI lshift, immI_bitmask
ins_pipe(ialu_reg_shift);
%}
// This pattern is automatically generated from aarch64_ad.m4
// DO NOT EDIT ANYTHING IN THIS SECTION OF THE FILE
// Can skip int2long conversions after AND with small bitmask
instruct ubfizIConvI2LAndI(iRegLNoSp dst, iRegI src, immI_bitmask msk)
%{
match(Set dst (ConvI2L (AndI src msk)));
ins_cost(INSN_COST);
format %{ "ubfiz $dst, $src, 0, exact_log2($msk + 1) " %}
ins_encode %{
__ ubfiz(as_Register($dst$$reg), as_Register($src$$reg), 0, exact_log2($msk$$constant + 1));
%}
ins_pipe(ialu_reg_shift);
%}
// Rotations
// This pattern is automatically generated from aarch64_ad.m4

15
src/hotspot/cpu/aarch64/aarch64_ad.m4
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@ -278,6 +278,21 @@ instruct ubfizIConvI2L(iRegLNoSp dst, iRegIorL2I src, immI lshift, immI_bitmask
ins_pipe(ialu_reg_shift);
%}
// This pattern is automatically generated from aarch64_ad.m4
// DO NOT EDIT ANYTHING IN THIS SECTION OF THE FILE
// Can skip int2long conversions after AND with small bitmask
instruct ubfizIConvI2LAndI(iRegLNoSp dst, iRegI src, immI_bitmask msk)
%{
match(Set dst (ConvI2L (AndI src msk)));
ins_cost(INSN_COST);
format %{ "ubfiz $dst, $src, 0, exact_log2($msk + 1) " %}
ins_encode %{
__ ubfiz(as_Register($dst$$reg), as_Register($src$$reg), 0, exact_log2($msk$$constant + 1));
%}
ins_pipe(ialu_reg_shift);
%}
// Rotations dnl
define(`EXTRACT_INSN',`

10
test/micro/org/openjdk/bench/vm/compiler/SkipIntToLongCast.java
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@ -47,6 +47,7 @@ public class SkipIntToLongCast {
private static final long ARRAYSIZE_L = 40L;
public int[] intValues;
public int intValue;
@Setup
public void setup() {
@ -76,4 +77,13 @@ public class SkipIntToLongCast {
}
return 0;
}
@Benchmark
public long skipMaskedSmallPositiveCast() {
int value = intValue;
return (long)(value & 0x1) ^ (long)(value & 0x3) ^ (long)(value & 0x7) ^ (long)(value & 0xF) ^
(long)(value & 0x1F) ^ (long)(value & 0x3F) ^ (long)(value & 0x7F) ^ (long)(value & 0xFF) ^
(long)(value & 0x1FF) ^ (long)(value & 0x3FF) ^ (long)(value & 0x7FF) ^ (long)(value & 0xFFF) ^
(long)(value & 0x1FFF) ^ (long)(value & 0x3FFF) ^ (long)(value & 0x7FFF) ^ (long)(value & 0xFFFF);
}
}