For performance reasons it is important to write the full 64 bits of
an FPR target reg even when dealing with 32 bit values. So we chose
lder over ler for 32 bit float register moves. lder zero-extends the
32 bit value from the source reg to 64 bit in the target. However,
since it actually doesn't matter whether we write the upper 32 bits
with zeros or with any other garbage we can also use ldr instead. It
is bit shorter and therefore will do good for I-Cache usage.
gcc/ChangeLog:
2016-04-29 Andreas Krebbel <krebbel@linux.vnet.ibm.com>
* config/s390/2964.md ("z13_unit_fxu", "z13_0"): Remove lder.
* config/s390/s390.md ("movsi_larl", "*movsi_esa", "mov<mode>"):
Change lder to ldr.
* config/s390/vector.md ("mov<mode>"): Likewise.
From-SVN: r235627
