http://llvm.org/bugs/show_bug.cgi?id=11264
Summary: Duplicate strings
Product: clang
Version: 2.9
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
In a simple program with duplicate strings in printf, clang creates two
identical string constants:
#include <stdio.h>
void gp2() {
printf("hello\n");
printf("hello\n");
}
The bitcode file has two different string constants.
The x86 code generator removes the duplicate but in both Arm and Mips the
duplicate is preserved.
.file "gp2.c"
.text
.globl gp2
.align 16, 0x90
.type gp2,@function
gp2: # @gp2
.Ltmp2:
.cfi_startproc
# BB#0: # %entry
pushq %rbp
.Ltmp3:
.cfi_def_cfa_offset 16
.Ltmp4:
.cfi_offset %rbp, -16
movq %rsp, %rbp
.Ltmp5:
.cfi_def_cfa_register %rbp
movl $str, %edi
callq puts
movl $str1, %edi
popq %rbp
jmp puts # TAILCALL
.Ltmp6:
.size gp2, .Ltmp6-gp2
.Ltmp7:
.cfi_endproc
.Leh_func_end0:
.type str,@object # @str
.section .rodata,"a",@progbits
str:
.asciz "hello"
.size str, 6
.type str1,@object # @str1
str1:
.asciz "hello"
.size str1, 6
.section ".note.GNU-stack","",@progbits
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