-Original Message-
From: Richard Henderson [mailto:r...@redhat.com]
Sent: Sunday, October 12, 2014 5:40 AM
To: Zhenqiang Chen; gcc-patches@gcc.gnu.org
Subject: Re: [Ping] [PATCH, 10/10] aarch64: Handle ccmp in ifcvt to make
it
work with cmov
On 09/22/2014 11:46 PM, Zhenqiang
On 10/27/2014 12:50 AM, Zhenqiang Chen wrote:
Good point. It is not ccmp special. It is cbranchcc4 related. If I
understand correct, without cbranchcc4, we need put the result to a tmp
register and generate additional compares, which is not good for
performance.
It won't be an additional
On 09/22/2014 11:46 PM, Zhenqiang Chen wrote:
@@ -2375,10 +2387,21 @@ noce_get_condition (rtx_insn *jump, rtx_insn
**earliest, bool then_else_reversed
return cond;
}
+ /* For conditional compare, set ALLOW_CC_MODE to TRUE. */
+ if (targetm.gen_ccmp_first)
+{
+
Ping?
Patch is rebased and attached.
Thanks!
-Zhenqiang
ChangeLog
2014-09-23 Zhenqiang Chen zhenqiang.c...@linaro.org
Andrew Pinski apin...@cavium.com
* ccmp.c (used_in_cond_stmt_p): Hande ? expr.
* expr.c (expand_cond_expr_using_cmove): Handle CCmode.
*
Andrew,
Thanks for the input. Patch is updated with your codes. In addition,
add cstorecc4 and 4 test cases. So it can optimized the following
example
int foo (int a, int b)
{
return a 0 b 7;
}
to:
cmpw0, wzr
ccmpw1, #6, #9, gt
csetw0, le
Bootstrap and no make
Hi,
The patch enhances ifcvt to handle conditional compare instruction
(ccmp) to make it work with cmov. For ccmp, ALLOW_CC_MODE is set to
TRUE when calling canonicalize_condition. And the backend does not
need to generate additional compare (CC, 0) for it.
Bootstrap and no check regression on
On Mon, Jun 23, 2014 at 12:01 AM, Zhenqiang Chen
zhenqiang.c...@linaro.org wrote:
Hi,
The patch enhances ifcvt to handle conditional compare instruction
(ccmp) to make it work with cmov. For ccmp, ALLOW_CC_MODE is set to
TRUE when calling canonicalize_condition. And the backend does not
need
On Mon, Jun 23, 2014 at 12:09 AM, Andrew Pinski pins...@gmail.com wrote:
On Mon, Jun 23, 2014 at 12:01 AM, Zhenqiang Chen
zhenqiang.c...@linaro.org wrote:
Hi,
The patch enhances ifcvt to handle conditional compare instruction
(ccmp) to make it work with cmov. For ccmp, ALLOW_CC_MODE is set
On 23 June 2014 15:09, Andrew Pinski pins...@gmail.com wrote:
On Mon, Jun 23, 2014 at 12:01 AM, Zhenqiang Chen
zhenqiang.c...@linaro.org wrote:
Hi,
The patch enhances ifcvt to handle conditional compare instruction
(ccmp) to make it work with cmov. For ccmp, ALLOW_CC_MODE is set to
TRUE
On Jun 23, 2014, at 12:37 AM, Zhenqiang Chen zhenqiang.c...@linaro.org
wrote:
On 23 June 2014 15:09, Andrew Pinski pins...@gmail.com wrote:
On Mon, Jun 23, 2014 at 12:01 AM, Zhenqiang Chen
zhenqiang.c...@linaro.org wrote:
Hi,
The patch enhances ifcvt to handle conditional compare
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