regrename.c (build_def_use): Don't rename asm operands that were originally hard registers.

        * regrename.c (build_def_use): Don't rename asm operands that
        were originally hard registers.
        (copyprop_hardreg_forward_1): Likewise.
        (find_oldest_value_reg): Copy ORIGINAL_REGNO from source.
        * varasm.c (make_decl_rtl): Use gen_rtx_raw_REG.  Set ORIGINAL_REGNO.

        * gcc.dg/asm-5.c: New.

From-SVN: r48435

1 files changed, 82 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/asm-5.c b/gcc/testsuite/gcc.dg/asm-5.c
new file mode 100644
index 0000000..7b8d0f2
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/asm-5.c
@@ -0,0 +1,82 @@
+/* Asm operands that are given as hard registers must keep the same
+   hard register all the way through compilation.  Example derived
+   from glibc source.  */
+/* { dg-do compile { target alpha*-*-* } } */
+/* { dg-options "-O2 -frename-registers -fcprop-registers" } */
+/* { dg-final { scan-assembler "callsys1 .0 .19 .0 .16 .17" } } */
+/* { dg-final { scan-assembler "callsys2 .0 .19 .0 .16 .17" } } */
+
+struct stat {
+  int dummy;
+};
+
+struct kernel_stat {
+  int dummy;
+};
+
+extern int xstat_conv (int vers, struct kernel_stat *kbuf, void *ubuf);
+extern int *__errno_location (void) __attribute__ ((__const__));
+
+int
+__fxstat (int vers, int fd, struct stat *buf)
+{
+  struct kernel_stat kbuf;
+  int result;
+
+  if (vers == 0)
+    return
+      ({
+	long _sc_ret, _sc_err;
+	{
+	  register long _sc_0 __asm__("$0");
+	  register long _sc_16 __asm__("$16");
+	  register long _sc_17 __asm__("$17");
+	  register long _sc_19 __asm__("$19");
+	  _sc_0 = 91;
+	  _sc_16 = (long) (fd);
+	  _sc_17 = (long) (((struct kernel_stat *) buf));
+	  __asm__("callsys1 %0 %1 %2 %3 %4"
+		  : "=r"(_sc_0), "=r"(_sc_19)
+		  : "0"(_sc_0), "r"(_sc_16), "r"(_sc_17)
+		  : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
+		    "$22", "$23", "$24", "$25", "$27", "$28", "memory");
+	  _sc_ret = _sc_0, _sc_err = _sc_19;
+	}
+	if (_sc_err)
+	  {
+	    (*__errno_location ()) = (_sc_ret);
+	    _sc_ret = -1L;
+	  }
+	_sc_ret;
+      });
+
+  result =
+      ({
+	long _sc_ret, _sc_err;
+	{
+	  register long _sc_0 __asm__("$0");
+	  register long _sc_16 __asm__("$16");
+	  register long _sc_17 __asm__("$17");
+	  register long _sc_19 __asm__("$19");
+	  _sc_0 = 91;
+	  _sc_16 = (long) (fd);
+	  _sc_17 = (long) ((&kbuf));
+	  __asm__("callsys2 %0 %1 %2 %3 %4"
+		  : "=r"(_sc_0), "=r"(_sc_19)
+		  : "0"(_sc_0), "r"(_sc_16), "r"(_sc_17)
+		  : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",
+		    "$22", "$23", "$24", "$25", "$27", "$28", "memory");
+	  _sc_ret = _sc_0, _sc_err = _sc_19;
+	}
+	if (_sc_err)
+	  {
+	    (*__errno_location ()) = (_sc_ret);
+	    _sc_ret = -1L;
+	  }
+	_sc_ret;
+      });
+  if (result == 0)
+    result = xstat_conv (vers, &kbuf, buf);
+
+  return result;
+}