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8209783: AArch64: Combine Multiply and Neg operations in C2

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Generate mneg instructions for a*(-b) or (-a)*b to save one instruction

Reviewed-by: adinn
This commit is contained in:
Pengfei Li 2018-08-22 16:06:51 +01:00 committed by Andrew Dinn
parent 40af989884
commit aafb128d89
1 changed files with 36 additions and 0 deletions
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36
src/hotspot/cpu/aarch64/aarch64.ad
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@ -9623,6 +9623,24 @@ instruct msubI(iRegINoSp dst, iRegIorL2I src1, iRegIorL2I src2, iRegIorL2I src3)
ins_pipe(imac_reg_reg);
%}
// Combined Integer Multiply & Neg
instruct mnegI(iRegINoSp dst, iRegIorL2I src1, iRegIorL2I src2, immI0 zero) %{
match(Set dst (MulI (SubI zero src1) src2));
match(Set dst (MulI src1 (SubI zero src2)));
ins_cost(INSN_COST * 3);
format %{ "mneg $dst, $src1, $src2" %}
ins_encode %{
__ mnegw(as_Register($dst$$reg),
as_Register($src1$$reg),
as_Register($src2$$reg));
%}
ins_pipe(imac_reg_reg);
%}
// Combined Long Multiply & Add/Sub
instruct maddL(iRegLNoSp dst, iRegL src1, iRegL src2, iRegL src3) %{
@ -9657,6 +9675,24 @@ instruct msubL(iRegLNoSp dst, iRegL src1, iRegL src2, iRegL src3) %{
ins_pipe(lmac_reg_reg);
%}
// Combined Long Multiply & Neg
instruct mnegL(iRegLNoSp dst, iRegL src1, iRegL src2, immL0 zero) %{
match(Set dst (MulL (SubL zero src1) src2));
match(Set dst (MulL src1 (SubL zero src2)));
ins_cost(INSN_COST * 5);
format %{ "mneg $dst, $src1, $src2" %}
ins_encode %{
__ mneg(as_Register($dst$$reg),
as_Register($src1$$reg),
as_Register($src2$$reg));
%}
ins_pipe(lmac_reg_reg);
%}
// Integer Divide
instruct divI(iRegINoSp dst, iRegIorL2I src1, iRegIorL2I src2) %{