* [PATCH] x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32
@ 2022-04-22 17:58 H.J. Lu
2022-04-22 18:06 ` Noah Goldstein
0 siblings, 1 reply; 3+ messages in thread
From: H.J. Lu @ 2022-04-22 17:58 UTC (permalink / raw)
To: libc-alpha
Clear the upper 32 bits in RDX (memory size) for x32 to fix
FAIL: string/tst-size_t-memcmp
FAIL: string/tst-size_t-memcmp-2
FAIL: string/tst-size_t-memcpy
FAIL: wcsmbs/tst-size_t-wmemcmp
on x32 introduced by
8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S
26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3
---
sysdeps/x86_64/memcmp.S | 4 ++++
sysdeps/x86_64/multiarch/memmove-ssse3.S | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
index b153694048..5718a7da86 100644
--- a/sysdeps/x86_64/memcmp.S
+++ b/sysdeps/x86_64/memcmp.S
@@ -46,6 +46,10 @@
.text
ENTRY(MEMCMP)
+# ifdef __ILP32__
+ /* Clear the upper 32 bits. */
+ movl %edx, %edx
+# endif
#ifdef USE_AS_WMEMCMP
/* Use 0xffff to test for mismatches on pmovmskb bitmask. Store
in ecx for code size. This is preferable to using `incw` as
diff --git a/sysdeps/x86_64/multiarch/memmove-ssse3.S b/sysdeps/x86_64/multiarch/memmove-ssse3.S
index 215583e7bd..310ff62b86 100644
--- a/sysdeps/x86_64/multiarch/memmove-ssse3.S
+++ b/sysdeps/x86_64/multiarch/memmove-ssse3.S
@@ -27,6 +27,10 @@ ENTRY(MEMMOVE_CHK)
END(MEMMOVE_CHK)
ENTRY_P2ALIGN(MEMMOVE, 6)
+# ifdef __ILP32__
+ /* Clear the upper 32 bits. */
+ movl %edx, %edx
+# endif
movq %rdi, %rax
L(start):
cmpq $16, %rdx
--
2.35.1
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32
2022-04-22 17:58 [PATCH] x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32 H.J. Lu
@ 2022-04-22 18:06 ` Noah Goldstein
2022-05-12 20:12 ` Sunil Pandey
0 siblings, 1 reply; 3+ messages in thread
From: Noah Goldstein @ 2022-04-22 18:06 UTC (permalink / raw)
To: H.J. Lu; +Cc: GNU C Library
On Fri, Apr 22, 2022 at 12:58 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> Clear the upper 32 bits in RDX (memory size) for x32 to fix
>
> FAIL: string/tst-size_t-memcmp
> FAIL: string/tst-size_t-memcmp-2
> FAIL: string/tst-size_t-memcpy
> FAIL: wcsmbs/tst-size_t-wmemcmp
>
> on x32 introduced by
>
> 8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S
> 26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3
> ---
> sysdeps/x86_64/memcmp.S | 4 ++++
> sysdeps/x86_64/multiarch/memmove-ssse3.S | 4 ++++
> 2 files changed, 8 insertions(+)
>
> diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
> index b153694048..5718a7da86 100644
> --- a/sysdeps/x86_64/memcmp.S
> +++ b/sysdeps/x86_64/memcmp.S
> @@ -46,6 +46,10 @@
>
> .text
> ENTRY(MEMCMP)
> +# ifdef __ILP32__
> + /* Clear the upper 32 bits. */
> + movl %edx, %edx
> +# endif
> #ifdef USE_AS_WMEMCMP
> /* Use 0xffff to test for mismatches on pmovmskb bitmask. Store
> in ecx for code size. This is preferable to using `incw` as
> diff --git a/sysdeps/x86_64/multiarch/memmove-ssse3.S b/sysdeps/x86_64/multiarch/memmove-ssse3.S
> index 215583e7bd..310ff62b86 100644
> --- a/sysdeps/x86_64/multiarch/memmove-ssse3.S
> +++ b/sysdeps/x86_64/multiarch/memmove-ssse3.S
> @@ -27,6 +27,10 @@ ENTRY(MEMMOVE_CHK)
> END(MEMMOVE_CHK)
>
> ENTRY_P2ALIGN(MEMMOVE, 6)
> +# ifdef __ILP32__
> + /* Clear the upper 32 bits. */
> + movl %edx, %edx
> +# endif
> movq %rdi, %rax
> L(start):
> cmpq $16, %rdx
> --
> 2.35.1
>
LGTM.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32
2022-04-22 18:06 ` Noah Goldstein
@ 2022-05-12 20:12 ` Sunil Pandey
0 siblings, 0 replies; 3+ messages in thread
From: Sunil Pandey @ 2022-05-12 20:12 UTC (permalink / raw)
To: Noah Goldstein, Libc-stable Mailing List; +Cc: H.J. Lu, GNU C Library
[-- Attachment #1: Type: text/plain, Size: 1919 bytes --]
On Fri, Apr 22, 2022 at 11:07 AM Noah Goldstein via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> On Fri, Apr 22, 2022 at 12:58 PM H.J. Lu <hjl.tools@gmail.com> wrote:
> >
> > Clear the upper 32 bits in RDX (memory size) for x32 to fix
> >
> > FAIL: string/tst-size_t-memcmp
> > FAIL: string/tst-size_t-memcmp-2
> > FAIL: string/tst-size_t-memcpy
> > FAIL: wcsmbs/tst-size_t-wmemcmp
> >
> > on x32 introduced by
> >
> > 8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S
> > 26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3
> > ---
> > sysdeps/x86_64/memcmp.S | 4 ++++
> > sysdeps/x86_64/multiarch/memmove-ssse3.S | 4 ++++
> > 2 files changed, 8 insertions(+)
> >
> > diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
> > index b153694048..5718a7da86 100644
> > --- a/sysdeps/x86_64/memcmp.S
> > +++ b/sysdeps/x86_64/memcmp.S
> > @@ -46,6 +46,10 @@
> >
> > .text
> > ENTRY(MEMCMP)
> > +# ifdef __ILP32__
> > + /* Clear the upper 32 bits. */
> > + movl %edx, %edx
> > +# endif
> > #ifdef USE_AS_WMEMCMP
> > /* Use 0xffff to test for mismatches on pmovmskb bitmask. Store
> > in ecx for code size. This is preferable to using `incw` as
> > diff --git a/sysdeps/x86_64/multiarch/memmove-ssse3.S b/sysdeps/x86_64/multiarch/memmove-ssse3.S
> > index 215583e7bd..310ff62b86 100644
> > --- a/sysdeps/x86_64/multiarch/memmove-ssse3.S
> > +++ b/sysdeps/x86_64/multiarch/memmove-ssse3.S
> > @@ -27,6 +27,10 @@ ENTRY(MEMMOVE_CHK)
> > END(MEMMOVE_CHK)
> >
> > ENTRY_P2ALIGN(MEMMOVE, 6)
> > +# ifdef __ILP32__
> > + /* Clear the upper 32 bits. */
> > + movl %edx, %edx
> > +# endif
> > movq %rdi, %rax
> > L(start):
> > cmpq $16, %rdx
> > --
> > 2.35.1
> >
>
> LGTM.
I would like to backport this patch to release branches.
Any comments or objections?
Conflict resolution patch attached.
--Sunil
[-- Attachment #2: 0023-x86-64-Fix-SSE2-memcmp-and-SSSE3-memmove-for-x32.patch --]
[-- Type: application/octet-stream, Size: 1187 bytes --]
From 6e37b24194e2361b513a49ab92a686956f1cbeac Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Fri, 22 Apr 2022 10:53:13 -0700
Subject: [PATCH 23/26] x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32
Clear the upper 32 bits in RDX (memory size) for x32 to fix
FAIL: string/tst-size_t-memcmp
FAIL: string/tst-size_t-memcmp-2
FAIL: string/tst-size_t-memcpy
FAIL: wcsmbs/tst-size_t-wmemcmp
on x32 introduced by
8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S
26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit 8ea20ee5f6145de4bff9481d3e09ac36ba9df8f3)
---
sysdeps/x86_64/memcmp.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S
index b153694048..5718a7da86 100644
--- a/sysdeps/x86_64/memcmp.S
+++ b/sysdeps/x86_64/memcmp.S
@@ -46,6 +46,10 @@
.text
ENTRY(MEMCMP)
+# ifdef __ILP32__
+ /* Clear the upper 32 bits. */
+ movl %edx, %edx
+# endif
#ifdef USE_AS_WMEMCMP
/* Use 0xffff to test for mismatches on pmovmskb bitmask. Store
in ecx for code size. This is preferable to using `incw` as
--
2.35.1
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-04-22 17:58 [PATCH] x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32 H.J. Lu
2022-04-22 18:06 ` Noah Goldstein
2022-05-12 20:12 ` Sunil Pandey
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