re PR target/92841 (Optimize -fstack-protector-strong code generation a bit)

	PR target/92841
	* config/i386/i386.md (*stack_protect_set_3): For pic_32bit_operand
	always use lea{q}, no matter what value which_alternative has.

	* gcc.target/i386/pr92841-2.c: New test.

From-SVN: r279633

gcc/ChangeLog

 2019-12-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/92841
+	* config/i386/i386.md (*stack_protect_set_3): For pic_32bit_operand
+	always use lea{q}, no matter what value which_alternative has.
+
 	PR target/93002
 	* config/i386/i386.md (dec reg; cmp $-1, reg; jne lab): New
 	define_peephole2.

gcc/config/i386/i386.md

@@ -19863,12 +19863,13 @@
 {
   output_asm_insn ("mov{q}\t{%3, %1|%1, %3}", operands);
   output_asm_insn ("mov{q}\t{%1, %0|%0, %1}", operands);
-  if (which_alternative == 0)
+  if (pic_32bit_operand (operands[2], DImode))
+    return "lea{q}\t{%E2, %1|%1, %E2}";
+  else if (which_alternative == 0)
     return "mov{l}\t{%k2, %k1|%k1, %k2}";
   else if (which_alternative == 2)
     return "movabs{q}\t{%2, %1|%1, %2}";
-  else if (pic_32bit_operand (operands[2], DImode)
-	   || ix86_use_lea_for_mov (insn, operands + 1))
+  else if (ix86_use_lea_for_mov (insn, operands + 1))
     return "lea{q}\t{%E2, %1|%1, %E2}";
   else
     return "mov{q}\t{%2, %1|%1, %2}";

gcc/testsuite/ChangeLog

 2019-12-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/92841
+	* gcc.target/i386/pr92841-2.c: New test.
+
 	PR target/93002
 	* gcc.target/i386/pr93002.c: New test.
 

gcc/testsuite/gcc.target/i386/pr92841-2.c

+/* PR target/92841 */
+/* { dg-do compile { target { { { *-*-linux* } && lp64 } && fstack_protector } } } */
+/* { dg-options "-O2 -fpic -fstack-protector-strong -masm=att" } */
+/* { dg-final { scan-assembler "leaq\tbuf2\\\(%rip\\\)," } } */
+
+static char buf2[64];
+void bar (char *, char *);
+
+void
+foo ()
+{
+  char buf[64];
+  char *p = buf2;
+  asm ("" : "+a" (p));
+  char *q = buf;
+  asm ("" : "+r" (q));
+  bar (p, q);
+}