From: Maciej W. Rozycki <macro@linux-mips.org>
Date: Sun, 13 Dec 2020 20:46:16 +0000 (+0000)
Subject: VAX: Remove unused register allocation from QMATH DImode add/sub handler
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3530ca075b083bca889ab9cdcc28d731df3a9088;p=gcc.git

VAX: Remove unused register allocation from QMATH DImode add/sub handler

An allocation is made for a temporary register, however it is unneeded,
as actually explained in the comment preceding the conditional block in
question, and consequently never used, so remove it.  The `temp' rtx is
already used elsewhere in the function, which is possibly why this dead
assignment has not been warned about.

	gcc/
	* config/vax/vax.c (vax_expand_addsub_di_operands): Remove
	unused register allocation.
---

diff --git a/gcc/config/vax/vax.c b/gcc/config/vax/vax.c
index 54d83dc1da2..57408a57adc 100644
--- a/gcc/config/vax/vax.c
+++ b/gcc/config/vax/vax.c
@@ -2082,7 +2082,6 @@ vax_expand_addsub_di_operands (rtx * operands, enum rtx_code code)
 	{
 	  if (code == MINUS && CONSTANT_P (operands[1]))
 	    {
-	      temp = gen_reg_rtx (DImode);
 	      emit_insn (gen_sbcdi3 (operands[0], const0_rtx, operands[2]));
 	      code = PLUS;
 	      gen_insn = gen_adcdi3;