Re: patch to fix PR60969

[Ramana Radhakrishnan <ramana dot gcc at googlemail dot com>]

>>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60969
>> FAIL: gcc.target/aarch64/table-intrinsics.c (internal compiler error)
>> FAIL: gcc.target/aarch64/table-intrinsics.c (test for excess errors)
>> Excess errors:
>> /work/gcc-clean/src/gcc/gcc/testsuite/gcc.target/aarch64/table-intrinsics.c:172:1: internal compiler error: Max. number of generated reload insns per insn is achieved (90)
>> 0x8923cd lra_constraints(bool)
>>       /work/gcc-clean/src/gcc/gcc/lra-constraints.c:4140
>> 0x882f62 lra(_IO_FILE*)
>>       /work/gcc-clean/src/gcc/gcc/lra.c:2353
>> 0x8453f6 do_reload
>>       /work/gcc-clean/src/gcc/gcc/ira.c:5457
>> 0x8453f6 execute
>>       /work/gcc-clean/src/gcc/gcc/ira.c:5618
>>
>>
> Sorry, I have no aarch64 machine.  Could you sent me the pre-processed
> file of the test.


Please find inline a reduced testcase that fails.

Compiler configured with

$SRC/gcc/configure --target=aarch64-none-elf



$>./xgcc -B`pwd` -S -O2 try.c
try.c: In function 'qtbl_tests8_2':
try.c:26:1: internal compiler error: Max. number of generated reload
insns per insn is achieved (90)

 }
 ^
0x8653f7 lra_constraints(bool)
        /work/wa1/src/gcc/gcc/lra-constraints.c:4140
0x855ca6 lra(_IO_FILE*)
        /work/wa1/src/gcc/gcc/lra.c:2353
0x81eada do_reload
        /work/wa1/src/gcc/gcc/ira.c:5457
0x81eada execute
        /work/wa1/src/gcc/gcc/ira.c:5618
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
compilation status=1


$>cat try.c
typedef __builtin_aarch64_simd_qi int8x8_t
  __attribute__ ((__vector_size__ (8)));
typedef __builtin_aarch64_simd_uqi uint8x8_t
  __attribute__ ((__vector_size__ (8)));
typedef __builtin_aarch64_simd_qi int8x16_t
  __attribute__ ((__vector_size__ (16)));
typedef struct int8x16x2_t
{
  int8x16_t val[2];
} int8x16x2_t;
__extension__ static __inline int8x8_t __attribute__ ((__always_inline__))
vqtbl2_s8 (int8x16x2_t tab, uint8x8_t idx)
{
  int8x8_t result;
  __asm__ ("ld1 {v16.16b, v17.16b}, %1\n\t"
    :"=w"(result)
    :"Q"(tab),"w"(idx)
    :"memory", "v16", "v17");
  return result;
}
int8x8_t
qtbl_tests8_2 (int8x16x2_t tab, uint8x8_t idx)
{
  return vqtbl2_s8 (tab, idx);
}




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