From: Torbjorn Granlund <tege@gnu.org>
Date: Wed, 3 Nov 1993 21:09:55 +0000 (+0000)
Subject: (REGISTER_MOVE_COST): Decrease cost for move from
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5ac6158d0b938f95a80827c7c72b5fadc4976ca7;p=gcc.git

(REGISTER_MOVE_COST): Decrease cost for move from
SHIFT_REGS to avoid regclass overflow.

From-SVN: r5986
---

diff --git a/gcc/config/pa/pa.h b/gcc/config/pa/pa.h
index 7665c4722e7..f683db38920 100644
--- a/gcc/config/pa/pa.h
+++ b/gcc/config/pa/pa.h
@@ -1475,14 +1475,15 @@ while (0)
 /* Compute extra cost of moving data between one register class
    and another.
 
-   Make moves from SAR so expensive they should never happen.
+   Make moves from SAR so expensive they should never happen.  We used to
+   have 0xffff here, but that generates overflow in rare cases.
 
    Copies involving a FP register and a non-FP register are relatively 
    expensive because they must go through memory.
 
    Other copies are reasonably cheap.  */
 #define REGISTER_MOVE_COST(CLASS1, CLASS2) \
- (CLASS1 == SHIFT_REGS ? 0xffff					\
+ (CLASS1 == SHIFT_REGS ? 0x100					\
   : FP_REG_CLASS_P (CLASS1) && ! FP_REG_CLASS_P (CLASS2) ? 16	\
   : FP_REG_CLASS_P (CLASS2) && ! FP_REG_CLASS_P (CLASS1) ? 16	\
   : 2)