|
 |
08c3a6 |
commit 4bbd0f866ad0ff197f72346f776ebee9b7e1a706
|
|
|
08c3a6 |
Author: Noah Goldstein <goldstein.w.n@gmail.com>
|
|
|
08c3a6 |
Date: Fri Dec 3 15:29:25 2021 -0800
|
|
|
08c3a6 |
|
|
|
08c3a6 |
x86-64: Use notl in EVEX strcmp [BZ #28646]
|
|
|
08c3a6 |
|
|
|
08c3a6 |
Must use notl %edi here as lower bits are for CHAR comparisons
|
|
|
08c3a6 |
potentially out of range thus can be 0 without indicating mismatch.
|
|
|
08c3a6 |
This fixes BZ #28646.
|
|
|
08c3a6 |
|
|
|
08c3a6 |
Co-Authored-By: H.J. Lu <hjl.tools@gmail.com>
|
|
|
08c3a6 |
(cherry picked from commit 4df1fa6ddc8925a75f3da644d5da3bb16eb33f02)
|
|
|
08c3a6 |
|
|
|
08c3a6 |
diff --git a/string/test-strcmp.c b/string/test-strcmp.c
|
|
|
08c3a6 |
index 7feababf4ddc5603..a0255b9625fbcedd 100644
|
|
|
08c3a6 |
--- a/string/test-strcmp.c
|
|
|
08c3a6 |
+++ b/string/test-strcmp.c
|
|
|
08c3a6 |
@@ -25,6 +25,7 @@
|
|
|
08c3a6 |
# define TEST_NAME "strcmp"
|
|
|
08c3a6 |
#endif
|
|
|
08c3a6 |
#include "test-string.h"
|
|
|
08c3a6 |
+#include <support/test-driver.h>
|
|
|
08c3a6 |
|
|
|
08c3a6 |
#ifdef WIDE
|
|
|
08c3a6 |
# include <wchar.h>
|
|
|
08c3a6 |
@@ -392,6 +393,32 @@ check2 (void)
|
|
|
08c3a6 |
}
|
|
|
08c3a6 |
}
|
|
|
08c3a6 |
|
|
|
08c3a6 |
+static void
|
|
|
08c3a6 |
+check3 (void)
|
|
|
08c3a6 |
+{
|
|
|
08c3a6 |
+ size_t size = 0xd000 + 0x4000;
|
|
|
08c3a6 |
+ CHAR *s1, *s2;
|
|
|
08c3a6 |
+ CHAR *buffer1 = mmap (NULL, size, PROT_READ | PROT_WRITE,
|
|
|
08c3a6 |
+ MAP_PRIVATE | MAP_ANON, -1, 0);
|
|
|
08c3a6 |
+ CHAR *buffer2 = mmap (NULL, size, PROT_READ | PROT_WRITE,
|
|
|
08c3a6 |
+ MAP_PRIVATE | MAP_ANON, -1, 0);
|
|
|
08c3a6 |
+ if (buffer1 == MAP_FAILED || buffer1 == MAP_FAILED)
|
|
|
08c3a6 |
+ error (EXIT_UNSUPPORTED, errno, "mmap failed");
|
|
|
08c3a6 |
+
|
|
|
08c3a6 |
+ s1 = (CHAR *) (buffer1 + 0x8f8 / sizeof (CHAR));
|
|
|
08c3a6 |
+ s2 = (CHAR *) (buffer2 + 0xcff3 / sizeof (CHAR));
|
|
|
08c3a6 |
+
|
|
|
08c3a6 |
+ STRCPY(s1, L("/export/redhat/rpms/BUILD/java-1.8.0-openjdk-1.8.0.312.b07-2.fc35.x86_64/openjdk/langtools/src/share/classes/com/sun/tools/doclets/internal/toolkit/util/PathDocFileFactory.java"));
|
|
|
08c3a6 |
+ STRCPY(s2, L("/export/redhat/rpms/BUILD/java-1.8.0-openjdk-1.8.0.312.b07-2.fc35.x86_64/openjdk/langtools/src/share/classes/com/sun/tools/doclets/internal/toolkit/taglets/ThrowsTaglet.java"));
|
|
|
08c3a6 |
+
|
|
|
08c3a6 |
+ int exp_result = SIMPLE_STRCMP (s1, s2);
|
|
|
08c3a6 |
+ FOR_EACH_IMPL (impl, 0)
|
|
|
08c3a6 |
+ check_result (impl, s1, s2, exp_result);
|
|
|
08c3a6 |
+
|
|
|
08c3a6 |
+ munmap ((void *) buffer1, size);
|
|
|
08c3a6 |
+ munmap ((void *) buffer2, size);
|
|
|
08c3a6 |
+}
|
|
|
08c3a6 |
+
|
|
|
08c3a6 |
int
|
|
|
08c3a6 |
test_main (void)
|
|
|
08c3a6 |
{
|
|
|
08c3a6 |
@@ -400,6 +427,7 @@ test_main (void)
|
|
|
08c3a6 |
test_init ();
|
|
|
08c3a6 |
check();
|
|
|
08c3a6 |
check2 ();
|
|
|
08c3a6 |
+ check3 ();
|
|
|
08c3a6 |
|
|
|
08c3a6 |
printf ("%23s", "");
|
|
|
08c3a6 |
FOR_EACH_IMPL (impl, 0)
|
|
|
08c3a6 |
diff --git a/sysdeps/x86_64/multiarch/strcmp-evex.S b/sysdeps/x86_64/multiarch/strcmp-evex.S
|
|
|
08c3a6 |
index 82f12ac89bcae20b..6f5c4bf984da2b80 100644
|
|
|
08c3a6 |
--- a/sysdeps/x86_64/multiarch/strcmp-evex.S
|
|
|
08c3a6 |
+++ b/sysdeps/x86_64/multiarch/strcmp-evex.S
|
|
|
08c3a6 |
@@ -656,12 +656,13 @@ L(loop_cross_page):
|
|
|
08c3a6 |
in YMM3 and 32 bytes at VEC_SIZE(%rdx, %r10). */
|
|
|
08c3a6 |
VPCMP $0, VEC_SIZE(%rdx, %r10), %YMM3, %k3{%k4}
|
|
|
08c3a6 |
kmovd %k3, %edi
|
|
|
08c3a6 |
+ /* Must use notl %edi here as lower bits are for CHAR
|
|
|
08c3a6 |
+ comparisons potentially out of range thus can be 0 without
|
|
|
08c3a6 |
+ indicating mismatch. */
|
|
|
08c3a6 |
+ notl %edi
|
|
|
08c3a6 |
# ifdef USE_AS_WCSCMP
|
|
|
08c3a6 |
/* Don't use subl since it is the upper 8 bits of EDI below. */
|
|
|
08c3a6 |
- notl %edi
|
|
|
08c3a6 |
andl $0xff, %edi
|
|
|
08c3a6 |
-# else
|
|
|
08c3a6 |
- incl %edi
|
|
|
08c3a6 |
# endif
|
|
|
08c3a6 |
|
|
|
08c3a6 |
# ifdef USE_AS_WCSCMP
|
|
|
08c3a6 |
@@ -743,12 +744,13 @@ L(loop_cross_page_2_vec):
|
|
|
08c3a6 |
in YMM1 and 32 bytes at (VEC_SIZE * 3)(%rdx, %r10). */
|
|
|
08c3a6 |
VPCMP $0, (VEC_SIZE * 3)(%rdx, %r10), %YMM1, %k3{%k4}
|
|
|
08c3a6 |
kmovd %k3, %edi
|
|
|
08c3a6 |
+ /* Must use notl %edi here as lower bits are for CHAR
|
|
|
08c3a6 |
+ comparisons potentially out of range thus can be 0 without
|
|
|
08c3a6 |
+ indicating mismatch. */
|
|
|
08c3a6 |
+ notl %edi
|
|
|
08c3a6 |
# ifdef USE_AS_WCSCMP
|
|
|
08c3a6 |
/* Don't use subl since it is the upper 8 bits of EDI below. */
|
|
|
08c3a6 |
- notl %edi
|
|
|
08c3a6 |
andl $0xff, %edi
|
|
|
08c3a6 |
-# else
|
|
|
08c3a6 |
- incl %edi
|
|
|
08c3a6 |
# endif
|
|
|
08c3a6 |
|
|
|
08c3a6 |
# ifdef USE_AS_WCSCMP
|