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References: <bug-30961-7667@http.gcc.gnu.org/bugzilla/>
Subject: [Bug target/30961] [4.1/4.2/4.3 regression] redundant reg/mem stores/moves
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From: "hjl at lucon dot org" <gcc-bugzilla@gcc.gnu.org>
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------- Comment #15 from hjl at lucon dot org  2007-07-31 19:35 -------
(In reply to comment #14)
> (In reply to comment #13)
> > Created an attachment (id=13550)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13550&action=view) [edit]
> > An experimental patch
> > 
> > This patch works for the testcase.
> 
> i've applied this patch to 4.2.1 and compile testcases:
> 
>
> 
> convert/m32/m64 look fine. load/m32/m64 still look unoptimal.
> 

Gcc 4.3 works:
        .text
        .p2align 4,,15
.globl convert
        .type   convert, @function
convert:
        movl    %edi, -4(%rsp)
        movss   -4(%rsp), %xmm0
        ret
        .size   convert, .-convert
        .p2align 4,,15
.globl load
        .type   load, @function
load:
        movzwl  (%rdi), %eax
        ret
        .size   load, .-load
        .ident  "GCC: (GNU) 4.3.0 20070731 (experimental) [trunk revision
127100]"


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30961