[LLVMbugs] [Bug 18163] New: [Inline] Functions not inlined due to flag -Oz is not emitted

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18163

            Bug ID: 18163
           Summary: [Inline] Functions not inlined due to flag -Oz is not
                    emitted
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: zhaoshiz at codeaurora.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11684
  --> http://llvm.org/bugs/attachment.cgi?id=11684&action=edit
LLVM-IR generated with -Oz

This bug is causing "undefined reference" error at link time. It seems the
inliner is doing fine, please see attached test case.

$ cat test.h 
extern int MAX_LEN;
extern int MIN_LEN;
extern int MAX_KEY;

struct HashTable;

extern struct HashTable* HT;
int HashAdd(struct HashTable* HT, int key, char* str);
int HashRemove(struct HashTable* HT, int key);

int hash(char* str, int len);

inline void goo (char* str, int len) {
  if (len <= MAX_LEN && len >= MIN_LEN) {
    int key = hash(str, len);
      if (key <= MAX_LEN && key >= 0)
        while (HashAdd(HT, key, str))
          HashRemove(HT, key);
  }
}

$ cat test.c 
#include <string.h>
#include "test.h"

int MAX_LEN;
int MIN_LEN;
int MAX_KEY;

struct HashTable;
struct HashTable* HT;

int main (int argc, char* argv[]) {
  unsigned i;
  for (i=0; i<argc; ++i) {
    int arglen = strlen(argv[i]);
    goo (argv[i], arglen < MAX_LEN ? arglen : MAX_LEN);
  }
}

$ cat Oz.s 
    .syntax unified
    .cpu    cortex-a9
    .eabi_attribute    6, 10
    .eabi_attribute    7, 65
    .eabi_attribute    8, 1
    .eabi_attribute    9, 2
    .fpu    neon
    .eabi_attribute    20, 1
    .eabi_attribute    21, 1
    .eabi_attribute    23, 3
    .eabi_attribute    24, 1
    .eabi_attribute    25, 1
    .eabi_attribute    36, 1
    .eabi_attribute    68, 1
    .file    "./test.c"
    .text
    .globl    main
    .align    2
    .type    main,%function
    .code    16
    .thumb_func
main:
    push.w    {r4, r5, r6, r7, r11, lr}
    mov    r5, r0
    mov    r4, r1
    cbz    r5, .LBB0_3
    ldr    r7, .LCPI0_0
.LBB0_2:
    ldr    r6, [r4], #4
    mov    r0, r6
    bl    strlen
    ldr    r1, [r7]
    cmp    r0, r1
    it    lt
    movlt    r1, r0
    mov    r0, r6
    bl    goo
    subs    r5, #1
    bne    .LBB0_2
.LBB0_3:
    movs    r0, #0
    pop.w    {r4, r5, r6, r7, r11, pc}
    .align    2
.LCPI0_0:
    .long    MAX_LEN
.Ltmp0:
    .size    main, .Ltmp0-main

    .type    MAX_LEN,%object
    .comm    MAX_LEN,4,4
    .type    MIN_LEN,%object
    .comm    MIN_LEN,4,4
    .type    MAX_KEY,%object
    .comm    MAX_KEY,4,4
    .type    HT,%object
    .comm    HT,4,4

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