* config/h8300/h8300.md: Add comments for define_peephole2.

From-SVN: r59690

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5717dea4ee3f076ff37f97a76f8c695156d90948..47f873553bd46e26f22b8f22fa1f32665e513e01 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2002-12-01  Kazu Hirata  <kazu@cs.umass.edu>
+
+       * config/h8300/h8300.md: Add comments for define_peephole2.
+
 2002-12-01  Mark Mitchell  <mark@codesourcery.com>
 
        * builtin-types.def (BT_SIZE): Use size_type_node.

diff --git a/gcc/config/h8300/h8300.md b/gcc/config/h8300/h8300.md
index 08bdb8e4c69d4fda4fc8090e1c6744aa7d4adce2..c846ac67bbd21bf9b92770befaf5138965dc3d2e 100644 (file)
--- a/gcc/config/h8300/h8300.md
+++ b/gcc/config/h8300/h8300.md
@@ -2353,6 +2353,8 @@
 ;; PEEPHOLE PATTERNS
 ;; -----------------------------------------------------------------
 
+;; Convert (A >> B) & C to (A & 255) >> B if C == 255 >> B.
+
 (define_peephole2
   [(parallel
      [(set (match_operand:HI 0 "register_operand" "")
@@ -2373,6 +2375,8 @@
       (clobber (match_dup 2))])]
   "")
 
+;; Convert (A << B) & C to (A & 255) << B if C == 255 << B.
+
 (define_peephole2
   [(parallel
      [(set (match_operand:HI 0 "register_operand" "")
@@ -2393,6 +2397,8 @@
       (clobber (match_dup 2))])]
   "")
 
+;; Convert (A >> B) & C to (A & 255) >> B if C == 255 >> B.
+
 (define_peephole2
   [(parallel
      [(set (match_operand:SI 0 "register_operand" "")
@@ -2413,6 +2419,8 @@
       (clobber (match_dup 2))])]
   "")
 
+;; Convert (A << B) & C to (A & 255) << B if C == 255 << B.
+
 (define_peephole2
   [(parallel
      [(set (match_operand:SI 0 "register_operand" "")
@@ -2433,6 +2441,8 @@
       (clobber (match_dup 2))])]
   "")
 
+;; Convert (A >> B) & C to (A & 65535) >> B if C == 65535 >> B.
+
 (define_peephole2
   [(parallel
      [(set (match_operand:SI 0 "register_operand" "")
@@ -2453,6 +2463,8 @@
       (clobber (match_dup 2))])]
   "")
 
+;; Convert (A << B) & C to (A & 65535) << B if C == 65535 << B.
+
 (define_peephole2
   [(parallel
      [(set (match_operand:SI 0 "register_operand" "")