stan/jdk-24
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

8150038: aarch64: make use of CBZ and CBNZ when comparing narrow pointer with zero

Browse Source 
Aarch64: c2 make use of CBZ and CBNZ when comparing narrow pointer with zero

Reviewed-by: aph
This commit is contained in:
Felix Yang 2016-02-17 20:19:24 +08:00 committed by Fei Yang
parent f73f7433d0
commit a30c46aa74
1 changed files with 19 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
hotspot/src/cpu/aarch64/vm/aarch64.ad
View File

@ -14191,6 +14191,25 @@ instruct cmpP_imm0_branch(cmpOp cmp, iRegP op1, immP0 op2, label labl, rFlagsReg
ins_pipe(pipe_cmp_branch);
%}
instruct cmpN_imm0_branch(cmpOp cmp, iRegN op1, immN0 op2, label labl, rFlagsReg cr) %{
match(If cmp (CmpN op1 op2));
predicate(n->in(1)->as_Bool()->_test._test == BoolTest::ne
|| n->in(1)->as_Bool()->_test._test == BoolTest::eq);
effect(USE labl);
ins_cost(BRANCH_COST);
format %{ "cbw$cmp $op1, $labl" %}
ins_encode %{
Label* L = $labl$$label;
Assembler::Condition cond = (Assembler::Condition)$cmp$$cmpcode;
if (cond == Assembler::EQ)
__ cbzw($op1$$Register, *L);
else
__ cbnzw($op1$$Register, *L);
%}
ins_pipe(pipe_cmp_branch);
%}
instruct cmpP_narrowOop_imm0_branch(cmpOp cmp, iRegN oop, immP0 zero, label labl, rFlagsReg cr) %{
match(If cmp (CmpP (DecodeN oop) zero));
predicate(n->in(1)->as_Bool()->_test._test == BoolTest::ne