[Patch] [AArch64] PR target 66049: fix add/extend gcc test suite failures

[Kumar, Venkataramanan]

Hi Maintainers, 

Please find the attached patch, that fixes add/extend gcc test suite failures in Aarch64 target.  
Ref: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66049

These tests started to fail after we prevented combiner from converting shift RTX to mult RTX, when the RTX is not inside a memory operation (r222874) .
Now I have added new add/extend patterns which are based on shift operations,  to fix these cases.

Testing status with the patch.

(1) GCC bootstrap on AArch64 successful. 
(2)  SPEC2006 INT runs did not show any degradation.
(3) gcc regression testing passed.

(-----Snip-----)
# Comparing 3 common sum files
## /bin/sh ./gcc-fsf-trunk/contrib/compare_tests  /tmp/gxx-sum1.24998 /tmp/gxx-sum2.24998
Tests that now work, but didn't before:

gcc.target/aarch64/adds1.c scan-assembler adds\tw[0-9]+, w[0-9]+, w[0-9]+, lsl 3
gcc.target/aarch64/adds1.c scan-assembler adds\tx[0-9]+, x[0-9]+, x[0-9]+, lsl 3
gcc.target/aarch64/adds3.c scan-assembler-times adds\tx[0-9]+, x[0-9]+, x[0-9]+, sxtw 2
gcc.target/aarch64/extend.c scan-assembler add\tw[0-9]+,.*uxth #?1
gcc.target/aarch64/extend.c scan-assembler add\tx[0-9]+,.*uxtw #?3
gcc.target/aarch64/extend.c scan-assembler sub\tw[0-9]+,.*uxth #?1
gcc.target/aarch64/extend.c scan-assembler sub\tx[0-9]+,.*uxth #?1
gcc.target/aarch64/extend.c scan-assembler sub\tx[0-9]+,.*uxtw #?3
gcc.target/aarch64/subs1.c scan-assembler subs\tw[0-9]+, w[0-9]+, w[0-9]+, lsl 3
gcc.target/aarch64/subs1.c scan-assembler subs\tx[0-9]+, x[0-9]+, x[0-9]+, lsl 3
gcc.target/aarch64/subs3.c scan-assembler-times subs\tx[0-9]+, x[0-9]+, x[0-9]+, sxtw 2

# No differences found in 3 common sum files  
(-----Snip-----)

The patterns are fixing the regressing tests, so I have not added any new tests. 
Regarding  removal of the old patterns based on "mults",  I am planning to do it as a separate work.

Is this OK for trunk ? 

gcc/ChangeLog 

2015-05-19  Venkataramanan Kumar  <venkataramanan.kumar@amd.com>

        * config/aarch64/aarch64.md
        (*adds_shift_imm_<mode>):  New pattern.
        (*subs_shift_imm_<mode>):  Likewise.
        (*adds_<optab><ALLX:mode>_shift_<GPI:mode>):  Likewise.
        (*subs_<optab><ALLX:mode>_shift_<GPI:mode>): Likewise.
        (*add_uxt<mode>_shift2): Likewise.
        (*add_uxtsi_shift2_uxtw): Likewise.
       (*sub_uxt<mode>_shift2): Likewise.
       (*sub_uxtsi_shift2_uxtw): Likewise.


Regards,
Venkat.
  


 
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