re PR target/63534 (Bootstrap failure on x86_64/i686-linux)

	PR target/63534
	PR target/63618
gcc/
	* cse.c (delete_trivially_dead_insns): Consider PIC register is used
	while it is pseudo.
	* dse.c (deletable_insn_p): Likewise.
gcc/testsuite/
	* gcc.target/i386/pr63618.c: New test.

From-SVN: r216596

gcc/ChangeLog

+2014-10-23  Evgeny Stupachenko  <evstupac@gmail.com>
+
+	PR target/63534
+	PR target/63618
+	* cse.c (delete_trivially_dead_insns): Consider PIC register is used
+	while it is pseudo.
+	* dse.c (deletable_insn_p): Likewise.
+
 2014-10-23  Georg-Johann Lay  <avr@gjlay.de>
 
 	* config/avr/avr.c: Fix GNU coding rules and typos.

gcc/cse.c

@@ -6957,6 +6957,12 @@ delete_trivially_dead_insns (rtx_insn *insns, int nreg)
       /* If no debug insns can be present, COUNTS is just an array
 	 which counts how many times each pseudo is used.  */
     }
+  /* Pseudo PIC register should be considered as used due to possible
+     new usages generated.  */
+  if (!reload_completed
+      && pic_offset_table_rtx
+      && REGNO (pic_offset_table_rtx) >= FIRST_PSEUDO_REGISTER)
+    counts[REGNO (pic_offset_table_rtx)]++;
   /* Go from the last insn to the first and delete insns that only set unused
      registers or copy a register to itself.  As we delete an insn, remove
      usage counts for registers it uses.

gcc/dce.c

@@ -127,6 +127,10 @@ deletable_insn_p (rtx_insn *insn, bool fast, bitmap arg_stores)
     if (HARD_REGISTER_NUM_P (DF_REF_REGNO (def))
 	&& global_regs[DF_REF_REGNO (def)])
       return false;
+    /* Initialization of pseudo PIC register should never be removed.  */
+    else if (DF_REF_REG (def) == pic_offset_table_rtx
+	     && REGNO (pic_offset_table_rtx) >= FIRST_PSEUDO_REGISTER)
+      return false;
 
   body = PATTERN (insn);
   switch (GET_CODE (body))

gcc/testsuite/ChangeLog

+2014-10-23  Evgeny Stupachenko  <evstupac@gmail.com>
+
+	PR target/63618
+	* gcc.target/i386/pr63618.c: New test.
+
 2014-10-23  Marek Polacek  <polacek@redhat.com>
 
 	PR c/63626

gcc/testsuite/gcc.target/i386/pr63618.c

+/* PR target/63618 */
+/* { dg-do run } */
+/* { dg-options "-O2 -mtune=corei7 -fno-inline" } */
+/* { dg-additional-options "-msse4.2" { target sse4 } } */
+/* { dg-additional-options "-fpic" { target fpic } } */
+
+static const __float128 cf = 0.1E+10Q;
+
+__float128
+f128_square(__float128 x)
+{
+  return x * x;
+}
+
+__float128
+f128_p3(__float128 x)
+{
+  return x * x * x;
+}
+
+__float128
+cond_f128_square (__float128 x, int p)
+{
+  x = f128_p3 (x);
+  if (p)
+    x = f128_square(cf);
+  return x;
+}
+
+int main()
+{
+  __float128 x = cond_f128_square (cf, 1);
+  return (int)(x < cf);
+}