-----Original Message-----
From: gcc-patches-owner@gcc.gnu.org [mailto:gcc-patches-
owner@gcc.gnu.org] On Behalf Of Zhenqiang Chen
Sent: 10 April 2013 09:02
To: gcc-patches@gcc.gnu.org
Cc: Marcus Shawcroft
Subject: [PATCH, AARCH64] Fix unrecognizable insn issue
Hi,
During expand, function aarch64_vcond_internal inverses some CMP, e.g.
a LE b -> b GE a
But if "b" is "CONST0_RTX", "b GE a" will be an illegal insn.
Yes it will. We should not be swapping the comparison in these cases.
Refer https://bugs.launchpad.net/linaro-toolchain-binaries/+bug/1163942
for detail about the issue.
The patch is to make "b" a register when inversing LE.
This patch is too restrictive. There is an `fcmle v0.2d #0` form which we
should be generating when we can. Also, you are only fixing one problematic
case where there are a few.
I don't have access to your reproducer, so I can't be certain this patch
is correct - I have created my own reproducer and added it in with
the other vect-fcm tests.
Thorough regression tests are ongoing for this patch, but it
passes aarch64.exp and vect.exp with no regressions.
Thanks,
James
---
gcc/
2013-04-10 James Greenhalgh <james.greenhalgh@arm.com>
* config/aarch64/aarch64-simd.md (aarch64_vcond_internal): Fix
floating-point vector comparisons against 0.
gcc/testsuite/
2013-04-10 James Greenhalgh <james.greenhalgh@arm.com>
* gcc.target/aarch64/vect-fcm.x: Add check for zero forms of
inverse operands.
* gcc.target/aarch64/vect-fcm-eq-d.c: Check that new zero form
loop is vectorized.
* gcc.target/aarch64/vect-fcm-eq-f.c: Likewise.
* gcc.target/aarch64/vect-fcm-ge-d.c: Check that new zero form
loop is vectorized and that the correct instruction is generated.
* gcc.target/aarch64/vect-fcm-ge-f.c: Likewise.
* gcc.target/aarch64/vect-fcm-gt-d.c: Likewise.
* gcc.target/aarch64/vect-fcm-gt-f.c: Likewise.