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1;DB6PR0801MB2005;7:XoVw4nh18+FyYD1n/+Rb/5SubbEdZSyo+hGXao7L7pZJmZUCmhdJdh+7YU4tTuPzVUwfIpJ6eOFlriT5VSIIePYHFR8UWGNFFiws4AS17/OPrah2fRCMYc8ZEArycagZ4FBEbywYA6RktfsDIZT93yJU0K1AQnJW1VSfetxnZeYoggIxaUGT/jUls35g+U8ILkjUeC7n8JfEczCC12vWB9rEyJv7pqf59x4SQfYOs2HY5ExJB7Q+iCad2boKETsIH+Hzyu87IF2XcdR9V/OF3xOKkNLns5u5A7WdR4MBmYI+T1ZX5ADn0OU1VLQia2cyYMDFwkmmPbayidhIxsvOGg== X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jun 2017 13:16:46.9556 (UTC) X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[217.140.96.140];Helo=[nebula.arm.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0801MB2005 X-IsSubscribed: yes X-SW-Source: 2017-06/txt/msg00312.txt.bz2 On Tue, Feb 28, 2017 at 12:29:50PM +0000, Kyrill Tkachov wrote: > Hi all, > > For the testcase in this patch we currently generate: > foo: > mov w1, 0 > ldaxr w2, [x0] > cmp w2, 3 > bne .L2 > stxr w3, w1, [x0] > cmp w3, 0 > .L2: > cset w0, eq > ret > > Note that the STXR could have been storing the WZR register instead of moving zero into w1. > This is due to overly strict predicates and constraints in the store exclusive pattern and the > atomic compare exchange expanders and splitters. > This simple patch fixes that in the patterns concerned and with it we can generate: > foo: > ldaxr w1, [x0] > cmp w1, 3 > bne .L2 > stxr w2, wzr, [x0] > cmp w2, 0 > .L2: > cset w0, eq > ret > > > Bootstrapped and tested on aarch64-none-linux-gnu. > Ok for GCC 8? OK. Thanks, James > 2017-02-28 Kyrylo Tkachov > > * config/aarch64/atomics.md (atomic_compare_and_swap expander): > Use aarch64_reg_or_zero predicate for operand 4. > (aarch64_compare_and_swap define_insn_and_split): > Use aarch64_reg_or_zero predicate for operand 3. Add 'Z' constraint. > (aarch64_store_exclusive): Likewise for operand 2. > > 2017-02-28 Kyrylo Tkachov > > * gcc.target/aarch64/atomic_cmp_exchange_zero_reg_1.c: New test.