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On Tue, Sep 05, 2000 at 08:54:40PM -0400, Alexander Viro wrote:

If gcc will _ever_ fail to optimize away else in
if (1) {
...
} else {
...
}
- it's a bug in gcc. Sorry. Checking for the absence of code paths that would
lead into block in question is trivial. I suspect that if you can demonstrate
such example to gcc folks they will consider it as an obvious bug.

4al.o: file format elf32-i386

Disassembly of section .text:

00000000 <func>:

extern volatile int a;

int func()
{
0: 55 push %ebp
1: 89 e5 mov %esp,%ebp
if(1)
a = 1;
3: c7 05 00 00 00 00 01 movl $0x1,0x0
a: 00 00 00
5: R_386_32 a
d: eb 0b jmp 1a <func+0x1a>
f: 90 nop
else
a = 5;
10: c7 05 00 00 00 00 05 movl $0x5,0x0
17: 00 00 00
12: R_386_32 a
}
1a: c9 leave
1b: c3 ret
-
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