1986-11-24 20:58:35 +00:00
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/* VAX descriptor table for ACK target optimizer,
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* Prolog prototype
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*/
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/* tunable constants-> */
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MAXOP 4;
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MAXLINELEN 50;
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LABEL_STARTER 'L';
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OPC_TERMINATOR ' ';
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%%;
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ZERO {strcmp(VAL,"$0") == 0};
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ONE {strcmp(VAL,"$1") == 0};
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M_ONE {strcmp(VAL,"$-1") == 0};
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CONST {VAL[0] == '$'};
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NUM,NUM1 {is_number(VAL)};
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REG {is_register(VAL)};
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SREG {is_scratchreg(VAL)};
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LAB,LAB2 {VAL[0] == 'L'};
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A,B {no_side_effects(VAL) };
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X,Y,LOG {TRUE};
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%%;
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movab 1(X),X -> incl X;
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movab -1(X),X -> decl X;
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movzbw ZERO,X -> clrw X;
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movzbl ZERO,X -> clrl X;
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movb ZERO,X -> clrb X;
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movw ZERO,X -> clrw X;
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movl ZERO,X -> clrl X;
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cvtbw ZERO,X -> clrw X;
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cvtww ZERO,X -> clrw X;
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cvtbl ZERO,X -> clrl X;
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cvtwl ZERO,X -> clrl X;
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/* change 3-operand instructions to 2-operand instructions */
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addw3 X,Y,Y -> addw2 X,Y;
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addl3 X,Y,Y -> addl2 X,Y;
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addf3 X,Y,Y -> addf2 X,Y;
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addd3 X,Y,Y -> addd2 X,Y;
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addw3 X,Y,X -> addw2 Y,X;
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addl3 X,Y,X -> addl2 Y,X;
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addf3 X,Y,X -> addf2 Y,X;
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addd3 X,Y,X -> addd2 Y,X;
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subw3 X,Y,Y -> subw2 X,Y;
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subl3 X,Y,Y -> subl2 X,Y;
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subf3 X,Y,Y -> subf2 X,Y;
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subd3 X,Y,Y -> subd2 X,Y;
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mulw3 X,Y,Y -> mulw2 X,Y;
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mull3 X,Y,Y -> mull2 X,Y;
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mulf3 X,Y,Y -> mulf2 X,Y;
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muld3 X,Y,Y -> muld2 X,Y;
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mulw3 X,Y,X -> mulw2 Y,X;
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mull3 X,Y,X -> mull2 Y,X;
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mulf3 X,Y,X -> mulf2 Y,X;
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muld3 X,Y,X -> muld2 Y,X;
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divw3 X,Y,Y -> divw2 X,Y;
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divl3 X,Y,Y -> divl2 X,Y;
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divf3 X,Y,Y -> divf2 X,Y;
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divd3 X,Y,Y -> divd2 X,Y;
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xorw3 X,Y,Y -> xorw2 X,Y;
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xorl3 X,Y,Y -> xorl2 X,Y;
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bisw3 X,Y,Y -> bisw2 X,Y;
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bisl3 X,Y,Y -> bisl2 X,Y;
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bisw3 X,Y,X -> bisw2 Y,X;
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bisl3 X,Y,X -> bisl2 Y,X;
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bicw3 X,Y,Y -> bicw2 X,Y;
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bicl3 X,Y,Y -> bicl2 X,Y;
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/* eliminate negative constants */
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addw2 $-NUM,X -> subw2 $NUM,X;
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addl2 $-NUM,X -> subl2 $NUM,X;
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addw3 $-NUM,X,Y -> subw3 $NUM,X,Y;
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addl3 $-NUM,X,Y -> subl3 $NUM,X,Y;
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addw3 X,$-NUM,Y -> subw3 $NUM,X,Y;
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addl3 X,$-NUM,Y -> subl3 $NUM,X,Y;
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subw2 $-NUM,X -> addw2 $NUM,X;
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subl2 $-NUM,X -> addl2 $NUM,X;
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subw3 $-NUM,X,Y -> addw3 $NUM,X,Y;
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subl3 $-NUM,X,Y -> addl3 $NUM,X,Y;
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/* use special instructions */
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addw2 ONE,X -> incw X;
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addl2 ONE,X -> incl X;
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subw2 ONE,X -> decw X;
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subl2 ONE,X -> decl X;
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addw2 M_ONE,X -> decw X;
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addl2 M_ONE,X -> decl X;
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subw2 M_ONE,X -> incw X;
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subl2 M_ONE,X -> incl X;
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bitw $NUM,A : jneq LAB
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{is_poweroftwo(NUM,LOG)}-> jbs $LOG,A,LAB;
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bitl $NUM,A : jneq LAB
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{is_poweroftwo(NUM,LOG)}-> jbs $LOG,A,LAB;
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bitw $NUM,A : jeql LAB
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{is_poweroftwo(NUM,LOG)}-> jbc $LOG,A,LAB;
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bitl $NUM,A : jeql LAB
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{is_poweroftwo(NUM,LOG)}-> jbc $LOG,A,LAB;
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bitw ONE,A : jneq LAB -> jlbs A,LAB;
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bitl ONE,A : jneq LAB -> jlbs A,LAB;
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bitw ONE,A : jneq LAB -> jlbc A,LAB;
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bitl ONE,A : jneq LAB -> jlbc A,LAB;
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ashl $-NUM,A,REG : bicw2 $~NUM1,REG
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{is_p2m1(NUM1,LOG)} -> extzv $NUM,$LOG,A,REG;
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ashl $-NUM,A,REG : bicl2 $~NUM1,REG
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{is_p2m1(NUM1,LOG)} -> extzv $NUM,$LOG,A,REG;
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/* stack optimizations */
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movl (sp)+,X : pushl X -> movl (sp),X;
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tstw (sp)+ : movw X,-(sp) -> movw X,(sp);
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tstl (sp)+ : movl X,-(sp) -> movl X,(sp);
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tstw (sp)+ : clrw -(sp) -> clrw (sp);
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tstl (sp)+ : clrl -(sp) -> clrl (sp);
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tstw (sp)+ : movzbw X,-(sp) -> movzbw X,(sp);
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tstl (sp)+ : movzbl X,-(sp) -> movzbl X,(sp);
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tstw (sp)+ : cvtbw X,-(sp) -> cvtbw X,(sp);
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tstl (sp)+ : cvtbl X,-(sp) -> cvtbl X,(sp);
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tstw (sp)+ : tstw X -> movw X,(sp)+;
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tstl (sp)+ : tstl X -> movl X,(sp)+;
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tstl (sp)+ : pushl X -> movl X,(sp);
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tstl (sp)+ : pushab X -> movab X,(sp);
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tstl (sp)+ : pushaw X -> movaw X,(sp);
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tstl (sp)+ : pushal X -> moval X,(sp);
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tstl (sp)+ : pushaq X -> movaq X,(sp);
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/* push constants */
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clrw -(sp) : movw $NUM,-(sp) -> pushl $NUM;
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clrw -(sp) : mnegw $NUM, -(sp) -> movzwl $-NUM,-(sp);
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clrw -(sp) : movw X,-(sp) -> movzwl X,-(sp);
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clrw -(sp) : cvtbw $NUM,-(sp) -> pushl $NUM;
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clrw -(sp) : cvtbw CONST,-(sp) -> movzwl CONST,-(sp);
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/* compare with zero */
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cmpb X,ZERO -> tstb X;
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cmpw X,ZERO -> tstw X;
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cmpl X,ZERO -> tstl X;
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cmpb ZERO,X : jneq LAB -> tstb X: jneq LAB;
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cmpw ZERO,X : jneq LAB -> tstw X: jneq LAB;
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cmpl ZERO,X : jneq LAB -> tstl X: jneq LAB;
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cmpb ZERO,X : jeql LAB -> tstb X: jeql LAB;
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cmpw ZERO,X : jeql LAB -> tstw X: jeql LAB;
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cmpl ZERO,X : jeql LAB -> tstl X: jeql LAB;
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cmpb ZERO,X : jgtr LAB -> tstb X: jlss LAB;
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cmpw ZERO,X : jgtr LAB -> tstw X: jlss LAB;
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cmpl ZERO,X : jgtr LAB -> tstl X: jlss LAB;
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cmpb ZERO,X : jlss LAB -> tstb X: jgtr LAB;
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cmpw ZERO,X : jlss LAB -> tstw X: jgtr LAB;
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cmpl ZERO,X : jlss LAB -> tstl X: jgtr LAB;
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cmpb ZERO,X : jgeq LAB -> tstb X: jleq LAB;
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cmpw ZERO,X : jgeq LAB -> tstw X: jleq LAB;
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cmpl ZERO,X : jgeq LAB -> tstl X: jleq LAB;
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cmpb ZERO,X : jleq LAB -> tstb X: jgeq LAB;
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cmpw ZERO,X : jleq LAB -> tstw X: jgeq LAB;
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cmpl ZERO,X : jleq LAB -> tstl X: jgeq LAB;
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/* compare with -1 */
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cmpw M_ONE,SREG : jeql LAB -> incw SREG : jeql LAB;
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cmpl M_ONE,SREG : jeql LAB -> incl SREG : jeql LAB;
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cmpw M_ONE,SREG : jneq LAB -> incw SREG : jneq LAB;
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cmpl M_ONE,SREG : jneq LAB -> incl SREG : jneq LAB;
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/* eliminate redundant tests */
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movw X,A : tstw A -> movw X,A;
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movl X,A : tstl A -> movl X,A;
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movw A,X : tstw A -> movw A,X;
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movl A,X : tstl A -> movl A,X;
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/* skip over jumps */
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jeql LAB : jbr LAB2 : labdef LAB -> jneq LAB2 : labdef LAB;
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jgeq LAB : jbr LAB2 : labdef LAB -> jlss LAB2 : labdef LAB;
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jgtr LAB : jbr LAB2 : labdef LAB -> jleq LAB2 : labdef LAB;
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jlss LAB : jbr LAB2 : labdef LAB -> jgeq LAB2 : labdef LAB;
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jleq LAB : jbr LAB2 : labdef LAB -> jgtr LAB2 : labdef LAB;
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jneq LAB : jbr LAB2 : labdef LAB -> jeql LAB2 : labdef LAB;
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/* Register propagation */
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1987-11-02 10:52:40 +00:00
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movl REG,A : ANY *A -> movl REG,A : ANY (REG);
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movl REG,A : ANY *A,X -> movl REG,A : ANY (REG),X;
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movl REG,A : ANY X,*A -> movl REG,A : ANY X,(REG);
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movl REG,A : ANY *A,X,Y -> movl REG,A : ANY (REG),X,Y;
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movl REG,A : ANY X,*A,Y -> movl REG,A : ANY X,(REG),Y;
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movl REG,A : ANY X,Y,*A -> movl REG,A : ANY X,Y,(REG);
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1986-11-24 20:58:35 +00:00
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%%;
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/* Auxiliary routines: */
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int is_number(s)
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register char *s;
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{
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while (*s >= '0' && *s <= '9') s++;
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return *s == '\0';
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}
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int is_poweroftwo(s,t)
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char *s,*t;
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{
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long arg, pow;
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register int i;
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arg = atol(s);
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pow = 1;
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i = 0;
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while (pow > 0) {
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if (pow == arg) {
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sprintf(t,"%d",i);
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return 1;
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}
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pow <<= 1;
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i++;
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}
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return 0;
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}
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int is_p2m1(s,t)
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char *s,*t;
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{
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long arg;
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char buf[MAXLINELEN];
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arg = atol(s)+1;
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sprintf(buf,"%ld",arg);
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return is_poweroftwo(buf,t);
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}
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int no_side_effects(s)
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register char *s;
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{
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for(;;) {
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switch(*s++) {
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case '\0': return TRUE;
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case '-': if (*s == '(') return FALSE; break;
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case ')': if (*s == '+') return FALSE; break;
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}
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}
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/* NOTREACHED */
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}
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int is_register(s)
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register char *s;
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{
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if (*s++ == 'r' && *s >= '0' && *s <= '9') {
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if (*s++ == '1' && (*s == '0' || *s == '1')) s++;
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return *s == '\0';
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}
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return FALSE;
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}
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int is_scratchreg(s)
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register char *s;
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{
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return *s++ == 'r' && *s >= '0' && *s++ <= '3' && *s == '\0';
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}
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