[Bug rtl-optimization/118992] New: Redundant argument set up for tail call

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118992

            Bug ID: 118992
           Summary: Redundant argument set up for tail call
           Product: gcc
           Version: 14.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: x86-64

[hjl@gnu-tgl-3 pr47253]$ cat j5.c
void bar0 (int);
void bar1 (int);

void
foo (int i)
{
  switch (i)
    {
    case 0: bar0 (i); break;
    case 1: bar1 (i); break;
    }
}
[hjl@gnu-tgl-3 pr47253]$ make j5.s
/export/build/gnu/tools-build/gcc-gitlab-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-gitlab-debug/build-x86_64-linux/gcc/ -O2 -S
j5.c
[hjl@gnu-tgl-3 pr47253]$ cat j5.s
        .file   "j5.c"
        .text
        .p2align 4
        .globl  foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        testl   %edi, %edi
        je      .L2
        cmpl    $1, %edi
        je      .L3
        ret
        .p2align 4,,10
        .p2align 3
.L3:
        movl    $1, %edi  <<<< This is redundant.
        jmp     bar1
        .p2align 4,,10
        .p2align 3
.L2:
        xorl    %edi, %edi <<< This is redundant.
        jmp     bar0
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .ident  "GCC: (GNU) 15.0.1 20250221 (experimental)"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-tgl-3 pr47253]$