[Bug target/54589] struct offset add should be folded into address calculation

[jaydeepchauhan1494 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54589

Jaydeep Chauhan <jaydeepchauhan1494 at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |jaydeepchauhan1494 at gmail dot co
                   |                            |m

--- Comment #10 from Jaydeep Chauhan <jaydeepchauhan1494 at gmail dot com> ---
 Hi,

 For the below case fix is not working.

 #include <emmintrin.h>

  struct param {
          int a, b, c, d;
          __m128i array[256];
  };

  struct param *p1;
  void func(struct param *p, unsigned char *src, int *dst)
  {
          __m128i x = p1->array[*src];
          *dst = _mm_cvtsi128_si32(x);
  }

  gcc generates for x86-64 with -O2:

  func:
        movzbl  (%rsi), %eax
        addq    $1, %rax
        salq    $4, %rax
        addq    p1(%rip), %rax
        movl    (%rax), %eax
        movl    %eax, (%rdx)
        ret

  clang generates for x86_64 with -O2:  

  func:                                  
        movq    p1(%rip), %rax
        movzbl  (%rsi), %ecx
        shlq    $4, %rcx
        movl    16(%rax,%rcx), %eax
        movl    %eax, (%rdx)
        retq