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| author | Torvald Riegel <torvald@gcc.gnu.org> | 2017-02-01 17:21:59 +0000 |
|---|---|---|
| committer | Torvald Riegel <torvald@gcc.gnu.org> | 2017-02-01 17:21:59 +0000 |
| commit | 969a32ce9354585f5f2b89df2e025f52eb0e1644 (patch) | |
| tree | ba5dc4787f7d4f9d23224810508207f4fcc188dc /gcc/testsuite/lib | |
| parent | 55e75c7c6bcfe386d0ecbf4611cff81040af00b3 (diff) | |
| download | gcc-969a32ce9354585f5f2b89df2e025f52eb0e1644.zip gcc-969a32ce9354585f5f2b89df2e025f52eb0e1644.tar.gz gcc-969a32ce9354585f5f2b89df2e025f52eb0e1644.tar.bz2 | |
Fix __atomic to not implement atomic loads with CAS.
gcc/
* builtins.c (fold_builtin_atomic_always_lock_free): Make "lock-free"
conditional on existance of a fast atomic load.
* optabs-query.c (can_atomic_load_p): New function.
* optabs-query.h (can_atomic_load_p): Declare it.
* optabs.c (expand_atomic_exchange): Always delegate to libatomic if
no fast atomic load is available for the particular size of access.
(expand_atomic_compare_and_swap): Likewise.
(expand_atomic_load): Likewise.
(expand_atomic_store): Likewise.
(expand_atomic_fetch_op): Likewise.
* testsuite/lib/target-supports.exp
(check_effective_target_sync_int_128): Remove x86 because it provides
no fast atomic load.
(check_effective_target_sync_int_128_runtime): Likewise.
libatomic/
* acinclude.m4: Add #define FAST_ATOMIC_LDST_*.
* auto-config.h.in: Regenerate.
* config/x86/host-config.h (FAST_ATOMIC_LDST_16): Define to 0.
(atomic_compare_exchange_n): New.
* glfree.c (EXACT, LARGER): Change condition and add comments.
From-SVN: r245098
Diffstat (limited to 'gcc/testsuite/lib')
| -rw-r--r-- | gcc/testsuite/lib/target-supports.exp | 21 |
1 files changed, 3 insertions, 18 deletions
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp index 95a1c50..7a26008 100644 --- a/gcc/testsuite/lib/target-supports.exp +++ b/gcc/testsuite/lib/target-supports.exp @@ -6514,9 +6514,7 @@ proc check_effective_target_section_anchors { } { # Return 1 if the target supports atomic operations on "int_128" values. proc check_effective_target_sync_int_128 { } { - if { (([istarget i?86-*-*] || [istarget x86_64-*-*]) - && ![is-effective-target ia32]) - || [istarget spu-*-*] } { + if { [istarget spu-*-*] } { return 1 } else { return 0 @@ -6525,23 +6523,10 @@ proc check_effective_target_sync_int_128 { } { # Return 1 if the target supports atomic operations on "int_128" values # and can execute them. +# This requires support for both compare-and-swap and true atomic loads. proc check_effective_target_sync_int_128_runtime { } { - if { (([istarget i?86-*-*] || [istarget x86_64-*-*]) - && ![is-effective-target ia32] - && [check_cached_effective_target sync_int_128_available { - check_runtime_nocache sync_int_128_available { - #include "cpuid.h" - int main () - { - unsigned int eax, ebx, ecx, edx; - if (__get_cpuid (1, &eax, &ebx, &ecx, &edx)) - return !(ecx & bit_CMPXCHG16B); - return 1; - } - } "" - }]) - || [istarget spu-*-*] } { + if { [istarget spu-*-*] } { return 1 } else { return 0 |