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Add and use branch on count instructions where possible.

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This commit is contained in:
Michael Munday 2017-01-11 16:38:35 -05:00
parent c8db1b960c
commit a3bb1cee5d
2 changed files with 8 additions and 18 deletions
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2
dynasm/dasm_s390x.lua
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@ -1240,6 +1240,8 @@ map_op = {
mghi_2 = "0000a70d0000RI-a",
-- RI-b mode instructions
bras_2 = "0000a7050000RI-b",
brct_2 = "0000a7060000RI-b",
brctg_2 = "0000a7070000RI-b",
-- RI-c mode instructions
brc_2 = "0000a7040000RI-c",
-- RIL-c

24
src/vm_s390x.dasc
View File

@ -1085,9 +1085,7 @@ static void build_subroutines(BuildCtx *ctx)
| la RA, 8(RA)
| lg RB, 0(RA)
| stg RB, -16(RA)
| ahi RD, -1
| jne <1
| // TODO: replace with branch on count (brctg).
| brct RD, <1
|2:
| llgf RD, SAVE_MULTRES
| j ->fff_res_
@ -3392,9 +3390,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| la RA, 8(RA)
| stg RB, 0(TMPR1)
| la TMPR1, 8(TMPR1)
| aghi RD, -1
| jne <3
| // TODO: replace decrement/branch with branch on count.
| brctg RD, <3
|4:
| ins_next
|
@ -3458,9 +3454,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| la RA, 8(RA)
| stg RB, 0(KBASE)
| la KBASE, 8(KBASE)
| // TODO: replace decrement/branch with brctg
| aghi NARGS:RD, -1
| jne <2
| brctg NARGS:RD, <2
|
| lg LFUNC:RB, -16(BASE)
|3:
@ -3698,9 +3692,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| lg RB, 0(KBASE, RA)
| stg RB, -16(KBASE)
| la KBASE, 8(KBASE)
| // TODO: replace with brctg RD, <2 once supported.
| aghi RD, -1
| jne <2
| brctg RD, <2
|3:
| llgf RD, SAVE_MULTRES // Note: MULTRES may be >256.
| llgc RB, PC_RB
@ -4037,9 +4029,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
| stg KBASE, 0(RD)
| la RD, 8(RD)
| stg TMPR1, -16(RA) // Clear old fixarg slot (help the GC).
| aghi RB, -1
| jne <1
| // TODO: brctg instead of decrement/branch
| brctg RB, <1
|2:
if (op == BC_JFUNCV) {
| llgh RD, PC_RD
@ -4052,9 +4042,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
|3: // Clear missing parameters.
| stg TMPR1, 0(RD) // TMPR1=LJ_TNIL (-1) here.
| la RD, 8(RD)
| aghi RB, -1
| jne <3
| // TODO: brctg instead of decrement/branch
| brctg RB, <3
| j <2
break;