(branch_true): Add comment about T-bit compares.

From-SVN: r12172

diff --git a/gcc/config/sh/sh.md b/gcc/config/sh/sh.md
index 2d112adb03f95425027f7c5fe84bcd5e8f0a34e8..a5ec8b769efe4616b66c1ad43478980082ae220b 100644 (file)
--- a/gcc/config/sh/sh.md
+++ b/gcc/config/sh/sh.md
@@ -1483,6 +1483,10 @@
 ;; Define the real conditional branch instructions.
 ;; ------------------------------------------------------------------------
 
+;; ??? Branches should compare T-bit against zero not one, so that they will
+;; be in canonical form.  get_condition in loop.c for instance will fail
+;; with these patterns.
+
 (define_insn "branch_true"
   [(set (pc) (if_then_else (eq (reg:SI 18) (const_int 1))
                           (label_ref (match_operand 0 "" ""))