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* config/h8300/h8300.md: Add comments about peephole2's.

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From-SVN: r78667
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Kazu Hirata 2004-02-29 19:18:37 +00:00 • committed by Kazu Hirata
parent 76c88fd97b
commit c8574b54f3
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2004-02-29 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md: Add comments about peephole2's.
2004-02-29 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md: Tweak operand numbers of some

74
gcc/config/h8300/h8300.md
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@ -4220,6 +4220,18 @@
}
operands[4] = GEN_INT (exact_log2 (INTVAL (operands[1]) + 1));")
;; Transform
;;
;; cmp.w #1,r0
;; bhi .L1
;;
;; into
;;
;; shar.w r0
;; bne .L1
;; TODO: Split the above peephole2.
;; Transform
;;
;; cmp.w #255,r0
@ -4260,6 +4272,18 @@
break;
}")
;; Transform
;;
;; cmp.w #255,r0
;; bhi .L1
;;
;; into
;;
;; mov.b r0h,r0h
;; bne .L1
;; TODO: Split the above peephole2.
;; (compare (reg:SI) (const_int)) takes 6 bytes, so we try to achieve
;; the equivalent with shorter sequences. Here is the summary. Cases
;; are grouped for each define_peephole2.
@ -4500,6 +4524,19 @@
}
operands[5] = GEN_INT (exact_log2 (INTVAL (operands[1]) + 1));")
;; Transform
;;
;; cmp.l #1,er0
;; bhi .L1
;;
;; into
;;
;; mov.l er0,er1
;; shar.l er1
;; bne .L1
;; TODO: Split the above peephole2.
;; Transform
;;
;; cmp.l #1,er0
@ -4547,6 +4584,18 @@
}
operands[4] = GEN_INT (exact_log2 (INTVAL (operands[1]) + 1));")
;; Transform
;;
;; cmp.l #1,er0
;; bhi .L1
;;
;; into
;;
;; shar.l er0
;; bne .L1
;; TODO: Split the above peephole2.
;; Transform
;;
;; cmp.l #15,er0
@ -4599,6 +4648,19 @@
}
operands[4] = GEN_INT (~INTVAL (operands[1]));")
;; Transform
;;
;; cmp.l #15,er0
;; bhi .L1
;;
;; into
;;
;; and #240,r0l
;; mov.l er0,er0
;; bne .L1
;; TODO: Split the above peephole2.
;; Transform
;;
;; cmp.l #65535,er0
@ -4639,6 +4701,18 @@
break;
}")
;; Transform
;;
;; cmp.l #65535,er0
;; bhi .L1
;;
;; into
;;
;; mov.l e0,e0
;; bne .L1
;; TODO: Split the above peephole2.
;; For constants like -1, -2, 1, 2, it is still cheaper to make a copy
;; of the register being tested, do the subtraction on the copy, and
;; then test the copy. We avoid this transformation if we see more