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8301033: RISC-V: Handle special cases for MinI/MaxI nodes for Zbb

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Reviewed-by: fjiang, luhenry, shade
This commit is contained in:
Fei Yang 2023-01-30 12:15:52 +00:00
parent 82df4a2aee
commit 61a5f114ee
1 changed files with 38 additions and 4 deletions
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42
src/hotspot/cpu/riscv/riscv_b.ad
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@ -395,12 +395,12 @@ instruct popCountL_b(iRegINoSp dst, iRegL src) %{
%}
// Max and Min
instruct minI_reg_b(iRegINoSp dst, iRegI src1, iRegI src2) %{
instruct minI_reg_reg_b(iRegINoSp dst, iRegI src1, iRegI src2) %{
predicate(UseZbb);
match(Set dst (MinI src1 src2));
ins_cost(ALU_COST);
format %{ "min $dst, $src1, $src2\t#@minI_reg_b" %}
format %{ "min $dst, $src1, $src2\t#@minI_reg_reg_b" %}
ins_encode %{
__ min(as_Register($dst$$reg), as_Register($src1$$reg), as_Register($src2$$reg));
@ -409,12 +409,12 @@ instruct minI_reg_b(iRegINoSp dst, iRegI src1, iRegI src2) %{
ins_pipe(ialu_reg_reg);
%}
instruct maxI_reg_b(iRegINoSp dst, iRegI src1, iRegI src2) %{
instruct maxI_reg_reg_b(iRegINoSp dst, iRegI src1, iRegI src2) %{
predicate(UseZbb);
match(Set dst (MaxI src1 src2));
ins_cost(ALU_COST);
format %{ "max $dst, $src1, $src2\t#@maxI_reg_b" %}
format %{ "max $dst, $src1, $src2\t#@maxI_reg_reg_b" %}
ins_encode %{
__ max(as_Register($dst$$reg), as_Register($src1$$reg), as_Register($src2$$reg));
@ -423,6 +423,40 @@ instruct maxI_reg_b(iRegINoSp dst, iRegI src1, iRegI src2) %{
ins_pipe(ialu_reg_reg);
%}
// special case for comparing with zero
// n.b. this is selected in preference to the rule above because it
// avoids loading constant 0 into a source register
instruct minI_reg_zero_b(iRegINoSp dst, iRegI src1, immI0 zero) %{
predicate(UseZbb);
match(Set dst (MinI src1 zero));
match(Set dst (MinI zero src1));
ins_cost(ALU_COST);
format %{ "min $dst, $src1, zr\t#@minI_reg_zero_b" %}
ins_encode %{
__ min(as_Register($dst$$reg), as_Register($src1$$reg), zr);
%}
ins_pipe(ialu_reg_reg);
%}
instruct maxI_reg_zero_b(iRegINoSp dst, iRegI src1, immI0 zero) %{
predicate(UseZbb);
match(Set dst (MaxI src1 zero));
match(Set dst (MaxI zero src1));
ins_cost(ALU_COST);
format %{ "max $dst, $src1, zr\t#@maxI_reg_zero_b" %}
ins_encode %{
__ max(as_Register($dst$$reg), as_Register($src1$$reg), zr);
%}
ins_pipe(ialu_reg_reg);
%}
// Abs
instruct absI_reg_b(iRegINoSp dst, iRegI src) %{
predicate(UseZbb);