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ARM64: Fuse BOR/BXOR and BNOT into ORN/EON.

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Contributed by Djordje Kovacevic and Stefan Pejic from RT-RK.com.
This commit is contained in:
Mike Pall 2016-12-15 22:47:40 +01:00
parent 3cfa9cb2bb
commit ebec2530be
2 changed files with 36 additions and 17 deletions
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52
src/lj_asm_arm64.h
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@ -1464,40 +1464,58 @@ static void asm_neg(ASMState *as, IRIns *ir)
asm_intneg(as, ir); asm_intneg(as, ir);
} }
static void asm_bitop(ASMState *as, IRIns *ir, A64Ins ai) static void asm_band(ASMState *as, IRIns *ir)
{ {
if (as->flagmcp == as->mcp && ai == A64I_ANDw) { A64Ins ai = A64I_ANDw;
if (asm_fuseandshift(as, ir))
return;
if (as->flagmcp == as->mcp) {
/* Try to drop cmp r, #0. */ /* Try to drop cmp r, #0. */
as->flagmcp = NULL; as->flagmcp = NULL;
as->mcp++; as->mcp++;
ai += A64I_ANDSw - A64I_ANDw; ai = A64I_ANDSw;
} }
if (ir->op2 == 0) { asm_intop(as, ir, ai);
Reg dest = ra_dest(as, ir, RSET_GPR); }
uint32_t m = asm_fuseopm(as, ai, ir->op1, RSET_GPR);
static void asm_borbxor(ASMState *as, IRIns *ir, A64Ins ai)
{
IRRef lref = ir->op1, rref = ir->op2;
IRIns *irl = IR(lref), *irr = IR(rref);
if ((canfuse(as, irl) && irl->o == IR_BNOT && !irref_isk(rref)) ||
(canfuse(as, irr) && irr->o == IR_BNOT && !irref_isk(lref))) {
Reg left, dest = ra_dest(as, ir, RSET_GPR);
uint32_t m;
if (irl->o == IR_BNOT) {
IRRef tmp = lref; lref = rref; rref = tmp;
}
left = ra_alloc1(as, lref, RSET_GPR);
ai |= A64I_ON;
if (irt_is64(ir->t)) ai |= A64I_X; if (irt_is64(ir->t)) ai |= A64I_X;
emit_d(as, ai^m, dest); m = asm_fuseopm(as, ai, IR(rref)->op1, rset_exclude(RSET_GPR, left));
emit_dn(as, ai^m, dest, left);
} else { } else {
asm_intop(as, ir, ai); asm_intop(as, ir, ai);
} }
} }
static void asm_band(ASMState *as, IRIns *ir)
{
if (asm_fuseandshift(as, ir))
return;
asm_bitop(as, ir, A64I_ANDw);
}
static void asm_bor(ASMState *as, IRIns *ir) static void asm_bor(ASMState *as, IRIns *ir)
{ {
if (asm_fuseorshift(as, ir)) if (asm_fuseorshift(as, ir))
return; return;
asm_bitop(as, ir, A64I_ORRw); asm_borbxor(as, ir, A64I_ORRw);
} }
#define asm_bnot(as, ir) asm_bitop(as, ir, A64I_MVNw) #define asm_bxor(as, ir) asm_borbxor(as, ir, A64I_EORw)
#define asm_bxor(as, ir) asm_bitop(as, ir, A64I_EORw)
static void asm_bnot(ASMState *as, IRIns *ir)
{
A64Ins ai = A64I_MVNw;
Reg dest = ra_dest(as, ir, RSET_GPR);
uint32_t m = asm_fuseopm(as, ai, ir->op1, RSET_GPR);
if (irt_is64(ir->t)) ai |= A64I_X;
emit_d(as, ai^m, dest);
}
static void asm_bswap(ASMState *as, IRIns *ir) static void asm_bswap(ASMState *as, IRIns *ir)
{ {

1
src/lj_target_arm64.h
View File

@ -142,6 +142,7 @@ typedef enum A64Ins {
A64I_S = 0x20000000, A64I_S = 0x20000000,
A64I_X = 0x80000000, A64I_X = 0x80000000,
A64I_EX = 0x00200000, A64I_EX = 0x00200000,
A64I_ON = 0x00200000,
A64I_K12 = 0x1a000000, A64I_K12 = 0x1a000000,
A64I_K13 = 0x18000000, A64I_K13 = 0x18000000,
A64I_LS_U = 0x01000000, A64I_LS_U = 0x01000000,