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[patch] h8300.md: Add comments about peephole2's.
- From: Kazu Hirata <kazu at cs dot umass dot edu>
- To: gcc-patches at gcc dot gnu dot org
- Date: Sun, 29 Feb 2004 14:18:47 -0500 (EST)
- Subject: [patch] h8300.md: Add comments about peephole2's.
Hi,
Attached is a patch to add comments.
I will address these TODOs very soon. The purpose of the patch is to
make subsequent patches more readable.
Committed as obvious.
Kazu Hirata
2004-02-29 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.md: Add comments about peephole2's.
Index: h8300.md
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/h8300/h8300.md,v
retrieving revision 1.277
diff -u -r1.277 h8300.md
--- h8300.md 29 Feb 2004 19:04:34 -0000 1.277
+++ h8300.md 29 Feb 2004 19:14:38 -0000
@@ -4222,6 +4222,18 @@
;; Transform
;;
+;; cmp.w #1,r0
+;; bhi .L1
+;;
+;; into
+;;
+;; shar.w r0
+;; bne .L1
+
+;; TODO: Split the above peephole2.
+
+;; Transform
+;;
;; cmp.w #255,r0
;; bgt .L1
;;
@@ -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.
@@ -4503,6 +4527,19 @@
;; 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
;; bgt .L1
;;
;; into
@@ -4549,6 +4586,18 @@
;; Transform
;;
+;; cmp.l #1,er0
+;; bhi .L1
+;;
+;; into
+;;
+;; shar.l er0
+;; bne .L1
+
+;; TODO: Split the above peephole2.
+
+;; Transform
+;;
;; cmp.l #15,er0
;; bgt .L1
;;
@@ -4601,6 +4650,19 @@
;; 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
;; bgt .L1
;;
@@ -4638,6 +4700,18 @@
operands[3] = operands[1];
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