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| author | Oliver Stannard <oliver.stannard@arm.com> | 2014-09-29 10:23:20 +0000 |
|---|---|---|
| committer | Oliver Stannard <oliver.stannard@arm.com> | 2014-09-29 10:23:20 +0000 |
| commit | 8cf642b8dac6eefa2c707a67dea810629aa13e10 (patch) | |
| tree | a4f39e15dec99aa71755692a91c90a3f2f557146 /lib/builtins/arm/sync_fetch_and_umax_8.S | |
| parent | 2f794721f44110059fae571430cb89fd64a3ff36 (diff) | |
| download | compiler-rt-8cf642b8dac6eefa2c707a67dea810629aa13e10.tar.gz | |
[compiler-rt] Do not use ldrexd or strexd on v7M
The ldrexd and strexd instructions are undefined for the ARMv7M
architecture, so we cannot use them to implement the
__sync_fetch_and_*_8 builtins. There is no other way to implement
these without OS support, so this patch #ifdef's these functions out
for M-class architectures.
There are no tests as I cannot find any existing tests for these
builtins.
I used the __ARM_ARCH_PROFILE predefine because __ARM_FEATURE_LDREX is
deprecated and not set by clang.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@218601 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/builtins/arm/sync_fetch_and_umax_8.S')
| -rw-r--r-- | lib/builtins/arm/sync_fetch_and_umax_8.S | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/builtins/arm/sync_fetch_and_umax_8.S b/lib/builtins/arm/sync_fetch_and_umax_8.S index 7716cfe82..d9b7965e5 100644 --- a/lib/builtins/arm/sync_fetch_and_umax_8.S +++ b/lib/builtins/arm/sync_fetch_and_umax_8.S @@ -14,6 +14,8 @@ #include "sync-ops.h" +#if __ARM_ARCH_PROFILE != 'M' #define umax_8(rD_LO, rD_HI, rN_LO, rN_HI, rM_LO, rM_HI) MINMAX_8(rD_LO, rD_HI, rN_LO, rN_HI, rM_LO, rM_HI, hi) SYNC_OP_8(umax_8) +#endif |