cse.c (delete_trivially_dead_insns): Also delete insns that copy a register to…

cse.c (delete_trivially_dead_insns): Also delete insns that copy a register to itself where the destination is a... * cse.c (delete_trivially_dead_insns): Also delete insns that copy a register to itself where the destination is a strict_low_part. From-SVN: r33090

cse.c (delete_trivially_dead_insns): Also delete insns that copy a register to…
cse.c (delete_trivially_dead_insns): Also delete insns that copy a register to itself where the destination is a... * cse.c (delete_trivially_dead_insns): Also delete insns that copy a register to itself where the destination is a strict_low_part. From-SVN: r33090
e8019e47 · John Wehle · John Wehle · 8e3f9094 · e8019e47 · e8019e47
Commit e8019e47 authored Apr 12, 2000 by John Wehle Committed by John Wehle Apr 12, 2000
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gcc/cse.c
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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+Wed Apr 12 01:00:44 EDT 2000  John Wehle  (john@feith.com)
+
+	* cse.c (delete_trivially_dead_insns): Also delete insns
+	that copy a register to itself where the destination is
+	a strict_low_part.
+
 2000-04-11  Richard Henderson  <rth@cygnus.com>

 	* flow.c (struct propagate_block_info): Add new_dead, new_live.

--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -7269,6 +7269,10 @@ delete_trivially_dead_insns (insns, nreg)
 	      && rtx_equal_p (SET_DEST (PATTERN (insn)),
 			      SET_SRC (PATTERN (insn))))
 	    ;
+	  else if (GET_CODE (SET_DEST (PATTERN (insn))) == STRICT_LOW_PART
+		   && rtx_equal_p (XEXP (SET_DEST (PATTERN (insn)), 0),
+				   SET_SRC (PATTERN (insn))))
+	    ;

 #ifdef HAVE_cc0
 	  else if (GET_CODE (SET_DEST (PATTERN (insn))) == CC0