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Subject: [Bug target/66049] New: Few AArch64 extend and add with shift tests generates sub optimal code with trunk gcc 6.0.
Date: Thu, 07 May 2015 12:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66049

            Bug ID: 66049
           Summary: Few AArch64 extend and add with shift tests generates
                    sub optimal code with trunk gcc 6.0.
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vekumar at gcc dot gnu.org
  Target Milestone: ---

After preventing conversion of shift to mults in combiner
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=222874

few Aarch64 target tests generates suboptimal code.

Tests that now fail, but worked 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

Sample Test case 
----------------
unsigned long long
adddi_uxtw (unsigned long long a, unsigned int i)
{
  /* { dg-final { scan-assembler "add\tx\[0-9\]+,.*uxtw #?3" } } */
  return a + ((unsigned long long)i << 3);
}

Before 

 add     x0, x0, x1, uxtw 3

Now 

ubfiz   x1, x1, 3, 32
add     x0, x1, x0