Date: Fri, 24 Aug 2012 08:35:52 -0400 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: build musl with clang On Fri, Aug 24, 2012 at 06:22:11PM +0600, agent wrote: > f: # @f > # BB#0: # %entry > subl $12, %esp > movl $100, (%esp) > calll malloc > testl %eax, %eax > je .LBB0_2 > # BB#1: # %if.then > movb $0, (%eax) > ..LBB0_2: # %if.end > addl $12, %esp > ret > > i suppose, 'if' is not elliminated. > > but if i create a function f2 with contents of musl's calloc it > fails the test. > > then i noticed in musl's calloc a cycle is wrapped into an 'if' with > p with negative subscript and tried the following: Does it work if you change the check not to use p[-1] but instead use: *(size_t *)((char *)p - sizeof(size_t)) Rich
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