s390: Fix tf_to_fprx2

Insn tf_to_fprx2 moves a TF value into a floating-point register pair.
For alternative 0, the input is a vector register, however, in the else
case instruction ldr is emitted which expects floating-point register
operands only.  Thus, this works only for vector registers which overlap
with floating-point registers.  Replace ldr with vlr so that the
remaining vector registers are dealt with, too.  Emitting a vlr instead
of a ldr is fine since the destination register %v0 is part of a
floating-point register pair which means that the low half of %v0 is
ignored in the end anyway and therefore may be clobbered.

gcc/ChangeLog:

	* config/s390/vector.md: Fix tf_to_fprx2 by using vlr instead of
	ldr.

(cherry picked from commit 8519b8ba9dd9567a5f90966351c1e758dbf511a4)

diff --git a/gcc/config/s390/vector.md b/gcc/config/s390/vector.md
index 35defb7043a4efd1f2c2baac5ed9acce478c8ea0..a79f21b05c73ada98a6a0af5595b5c82bb5f9145 100644 (file)
--- a/gcc/config/s390/vector.md
+++ b/gcc/config/s390/vector.md
@@ -938,7 +938,7 @@
       else
        {
          reg_pair += 2;  // get rid of prefix %f
-         snprintf (buf, sizeof (buf), "ldr\t%%f0,%%f1;vpdi\t%%%%v%s,%%v1,%%%%v%s,5", reg_pair, reg_pair);
+         snprintf (buf, sizeof (buf), "vlr\t%%v0,%%v1;vpdi\t%%%%v%s,%%v1,%%%%v%s,5", reg_pair, reg_pair);
          output_asm_insn (buf, operands);
          return "";
        }