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View File gcc7-pr81481.diff of Package gcc7 (Project openSUSE:Factory)

2017-09-29  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/81481
	* ira-costs.c (scan_one_insn): Don't take into account PIC equiv
	with a symbol for LRA.

	* gcc.target/i386/pr81481.c: New.
 
Index: gcc/testsuite/gcc.target/i386/pr81481.c
===================================================================
--- gcc/testsuite/gcc.target/i386/pr81481.c	(nonexistent)
+++ gcc/testsuite/gcc.target/i386/pr81481.c	(revision 253300)
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target ssse3 } */
+/* { dg-options "-O2 -fpic -mssse3" } */
+/* { dg-final { scan-assembler-not "pshufb\[ \t\]\\(%esp\\)" } } */
+#include <immintrin.h>
+
+extern const signed char c[31] __attribute__((visibility("hidden")));
+
+__m128i f(__m128i *x, void *v)
+{
+  int i;
+  asm("# %0" : "=r"(i));
+  __m128i t = _mm_loadu_si128((void*)&c[i]);
+  __m128i xx = *x;
+  xx =  _mm_shuffle_epi8(xx, t);
+  asm("# %0 %1 %2" : "+x"(xx) : "r"(c), "r"(i));
+  return xx;
+}
Index: gcc/ira-costs.c
===================================================================
--- gcc/ira-costs.c	(revision 253299)
+++ gcc/ira-costs.c	(revision 253300)
@@ -1471,7 +1471,10 @@ scan_one_insn (rtx_insn *insn)
 	      && targetm.legitimate_constant_p (GET_MODE (SET_DEST (set)),
 						XEXP (note, 0))
 	      && REG_N_SETS (REGNO (SET_DEST (set))) == 1))
-      && general_operand (SET_SRC (set), GET_MODE (SET_SRC (set))))
+      && general_operand (SET_SRC (set), GET_MODE (SET_SRC (set)))
+      /* LRA does not use equiv with a symbol for PIC code.  */
+      && (! ira_use_lra_p || ! pic_offset_table_rtx
+	  || ! contains_symbol_ref_p (XEXP (note, 0))))
     {
       enum reg_class cl = GENERAL_REGS;
       rtx reg = SET_DEST (set);