public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc/devel/omp/gcc-11] [PATCH] GCN: Implement __atomic_compare_exchange_{1, 2} in libgcc [PR102215]
@ 2022-05-30 10:13 Andrew Jenner
0 siblings, 0 replies; only message in thread
From: Andrew Jenner @ 2022-05-30 10:13 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:dfe61b1ec5f5c7953bebb11b0dfb7b32e2c39b02
commit dfe61b1ec5f5c7953bebb11b0dfb7b32e2c39b02
Author: Andrew Jenner <andrew@codesourcery.com>
Date: Mon May 30 10:12:15 2022 +0000
[PATCH] GCN: Implement __atomic_compare_exchange_{1,2} in libgcc [PR102215]
libgcc/ChangeLog:
PR target/102215
* config/gcn/atomic.c (__sync_val_compare_and_swap_##SIZE): Move
a line up to non-arg-dependent value first.
(__ATOMIC_COMPARE_EXCHANGE): Define + call to generate
__atomic_compare_exchange_{1,2}.
Diff:
---
libgcc/ChangeLog.omp | 7 +++++++
libgcc/config/gcn/atomic.c | 29 ++++++++++++++++++++++++++++-
2 files changed, 35 insertions(+), 1 deletion(-)
diff --git a/libgcc/ChangeLog.omp b/libgcc/ChangeLog.omp
new file mode 100644
index 00000000000..4d5600e71a1
--- /dev/null
+++ b/libgcc/ChangeLog.omp
@@ -0,0 +1,7 @@
+2022-03-09 Tobias Burnus <tobias@codesourcery.com>
+
+ PR target/102215
+ * config/gcn/atomic.c (__sync_val_compare_and_swap_##SIZE): Move
+ a line up to non-arg-dependent value first.
+ (__ATOMIC_COMPARE_EXCHANGE): Define + call to generate
+ __atomic_compare_exchange_{1,2}.
diff --git a/libgcc/config/gcn/atomic.c b/libgcc/config/gcn/atomic.c
index 1f6ee9e0dfd..c0ea6612cdc 100644
--- a/libgcc/config/gcn/atomic.c
+++ b/libgcc/config/gcn/atomic.c
@@ -28,9 +28,9 @@
TYPE \
__sync_val_compare_and_swap_##SIZE (TYPE *ptr, TYPE oldval, TYPE newval) \
{ \
+ unsigned int valmask = (1 << (SIZE * 8)) - 1; \
unsigned int *wordptr = (unsigned int *)((__UINTPTR_TYPE__ ) ptr & ~3UL); \
int shift = ((__UINTPTR_TYPE__ ) ptr & 3UL) * 8; \
- unsigned int valmask = (1 << (SIZE * 8)) - 1; \
unsigned int wordmask = ~(valmask << shift); \
unsigned int oldword = *wordptr; \
for (;;) \
@@ -57,3 +57,30 @@ __sync_bool_compare_and_swap_##SIZE (TYPE *ptr, TYPE oldval, TYPE newval) \
__SYNC_SUBWORD_COMPARE_AND_SWAP (unsigned char, 1)
__SYNC_SUBWORD_COMPARE_AND_SWAP (unsigned short, 2)
+
+#define __ATOMIC_COMPARE_EXCHANGE(TYPE,SIZE) \
+bool \
+__atomic_compare_exchange_##SIZE (TYPE *ptr, TYPE *expected, \
+ TYPE desired, bool weak, \
+ int success_memorder, int failure_memorder) \
+{ \
+ unsigned int valmask = (1 << (SIZE * 8)) - 1; \
+ \
+ unsigned int *wordptr = (unsigned int *)((__UINTPTR_TYPE__ ) ptr & ~3UL); \
+ int ptrshift = ((__UINTPTR_TYPE__ ) ptr & 3UL) * 8; \
+ unsigned int wordmask = ~(valmask << ptrshift); \
+ \
+ unsigned int ptrword = *wordptr; \
+ unsigned int exptword = ptrword & wordmask; \
+ unsigned int newword = ptrword & wordmask; \
+ exptword |= ((unsigned int) *expected) << ptrshift; \
+ newword |= ((unsigned int) desired) << ptrshift; \
+ if (__atomic_compare_exchange_4 (wordptr, &exptword, newword, weak, \
+ success_memorder, failure_memorder)) \
+ return true; \
+ *expected = (TYPE) ((exptword >> ptrshift) & valmask); \
+ return false; \
+}
+
+__ATOMIC_COMPARE_EXCHANGE (unsigned char, 1)
+__ATOMIC_COMPARE_EXCHANGE (unsigned short, 2)
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2022-05-30 10:13 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-05-30 10:13 [gcc/devel/omp/gcc-11] [PATCH] GCN: Implement __atomic_compare_exchange_{1, 2} in libgcc [PR102215] Andrew Jenner
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).