[llvm-bugs] [Bug 38241] New: Opportunity to skip dereferencie and move

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jul 20 00:49:33 PDT 2018


            Bug ID: 38241
           Summary: Opportunity to skip dereferencie and move
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: llvm-bugs at lists.llvm.org

typedef struct X {
    int *p;
    int *q;
} example_t;

int foo(example_t *e, int x) {
    *e->p = x;
    example_t c = *e;
    return *c.p;

Clang trunk -O3
foo(X*, int):                             # @foo(X*, int)
        mov     rax, qword ptr [rdi]
        mov     dword ptr [rax], esi
        mov     rax, qword ptr [rdi]
        mov     eax, dword ptr [rax]

GGC trunk
foo(X*, int):
        mov     rdx, QWORD PTR [rdi]
        mov     eax, esi
        mov     DWORD PTR [rdx], esi

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