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8300109: RISC-V: Improve code generation for MinI/MaxI nodes

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Reviewed-by: fjiang, luhenry, shade
This commit is contained in:
Fei Yang 2023-01-18 01:14:47 +00:00
parent 89a032dc05
commit f1194dc07e
1 changed files with 92 additions and 2 deletions
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94
src/hotspot/cpu/riscv/riscv.ad
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@ -8657,6 +8657,96 @@ instruct cmpLTMask_reg_zero(iRegINoSp dst, iRegIorL2I op, immI0 zero)
// ============================================================================
// Max and Min
instruct minI_reg_reg(iRegINoSp dst, iRegI src)
%{
match(Set dst (MinI dst src));
ins_cost(BRANCH_COST + ALU_COST);
format %{
"ble $dst, $src, skip\t#@minI_reg_reg\n\t"
"mv $dst, $src\n\t"
"skip:"
%}
ins_encode %{
Label Lskip;
__ ble(as_Register($dst$$reg), as_Register($src$$reg), Lskip);
__ mv(as_Register($dst$$reg), as_Register($src$$reg));
__ bind(Lskip);
%}
ins_pipe(pipe_class_compare);
%}
instruct maxI_reg_reg(iRegINoSp dst, iRegI src)
%{
match(Set dst (MaxI dst src));
ins_cost(BRANCH_COST + ALU_COST);
format %{
"bge $dst, $src, skip\t#@maxI_reg_reg\n\t"
"mv $dst, $src\n\t"
"skip:"
%}
ins_encode %{
Label Lskip;
__ bge(as_Register($dst$$reg), as_Register($src$$reg), Lskip);
__ mv(as_Register($dst$$reg), as_Register($src$$reg));
__ bind(Lskip);
%}
ins_pipe(pipe_class_compare);
%}
// 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(iRegINoSp dst, immI0 zero)
%{
match(Set dst (MinI dst zero));
match(Set dst (MinI zero dst));
ins_cost(BRANCH_COST + ALU_COST);
format %{
"blez $dst, skip\t#@minI_reg_zero\n\t"
"mv $dst, zr\n\t"
"skip:"
%}
ins_encode %{
Label Lskip;
__ blez(as_Register($dst$$reg), Lskip);
__ mv(as_Register($dst$$reg), zr);
__ bind(Lskip);
%}
ins_pipe(pipe_class_compare);
%}
instruct maxI_reg_zero(iRegINoSp dst, immI0 zero)
%{
match(Set dst (MaxI dst zero));
match(Set dst (MaxI zero dst));
ins_cost(BRANCH_COST + ALU_COST);
format %{
"bgez $dst, skip\t#@maxI_reg_zero\n\t"
"mv $dst, zr\n\t"
"skip:"
%}
ins_encode %{
Label Lskip;
__ bgez(as_Register($dst$$reg), Lskip);
__ mv(as_Register($dst$$reg), zr);
__ bind(Lskip);
%}
ins_pipe(pipe_class_compare);
%}
instruct minI_rReg(iRegINoSp dst, iRegI src1, iRegI src2)
%{
match(Set dst (MinI src1 src2));
@ -8683,7 +8773,7 @@ instruct minI_rReg(iRegINoSp dst, iRegI src1, iRegI src2)
__ bind(Ldone);
%}
ins_pipe(ialu_reg_reg);
ins_pipe(pipe_class_compare);
%}
instruct maxI_rReg(iRegINoSp dst, iRegI src1, iRegI src2)
@ -8713,7 +8803,7 @@ instruct maxI_rReg(iRegINoSp dst, iRegI src1, iRegI src2)
%}
ins_pipe(ialu_reg_reg);
ins_pipe(pipe_class_compare);
%}
// ============================================================================