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| author | Rong Xu <xur@google.com> | 2014-10-13 15:06:37 -0700 |
|---|---|---|
| committer | Rong Xu <xur@google.com> | 2014-10-13 15:06:37 -0700 |
| commit | c16bf8984b9f89eeb79abd9a3789151f5c98d02f (patch) | |
| tree | f4f01e14d95a1d713169e3064537758e1d594197 /gcc-4.9/gcc/doc | |
| parent | c5748954561f492fe1c4ea772e0290079af9960b (diff) | |
| download | toolchain_gcc-c16bf8984b9f89eeb79abd9a3789151f5c98d02f.tar.gz toolchain_gcc-c16bf8984b9f89eeb79abd9a3789151f5c98d02f.tar.bz2 toolchain_gcc-c16bf8984b9f89eeb79abd9a3789151f5c98d02f.zip | |
[gcc-4.9] fix for for cortex-a53 erratum 835769
This patch cherry picks r216116 from google/gcc-4_9 branch (which
is r216077 and r216079 from upstream gcc-4_9 branch).
Tested the built compiler with aarch64 devicde.
Change-Id: I75745fe35aae83bc3b64135a2efc7f8ffd9cfb1f
Diffstat (limited to 'gcc-4.9/gcc/doc')
| -rw-r--r-- | gcc-4.9/gcc/doc/install.texi | 10 | ||||
| -rw-r--r-- | gcc-4.9/gcc/doc/invoke.texi | 9 |
2 files changed, 19 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/doc/install.texi b/gcc-4.9/gcc/doc/install.texi index 80cb0a90c..b298321be 100644 --- a/gcc-4.9/gcc/doc/install.texi +++ b/gcc-4.9/gcc/doc/install.texi @@ -3788,6 +3788,16 @@ Binutils pre 2.24 does not have support for selecting @option{-mabi} and does not support ILP32. If it is used to build GCC 4.9 or later, GCC will not support option @option{-mabi=ilp32}. +To enable a workaround for the Cortex-A53 erratum number 835769 by default +(for all CPUs regardless of -mcpu option given) at configure time use the +@option{--enable-fix-cortex-a53-835769} option. This will enable the fix by +default and can be explicitly disabled during during compilation by passing the +@option{-mno-fix-cortex-a53-835769} option. Conversely, +@option{--disable-fix-cortex-a53-835769} will disable the workaround by +default. The workaround is disabled by default if neither of +@option{--enable-fix-cortex-a53-835769} or +@option{--disable-fix-cortex-a53-835769} is given at configure time. + @html <hr /> <!-- rs6000-ibm-aix*, powerpc-ibm-aix* --> diff --git a/gcc-4.9/gcc/doc/invoke.texi b/gcc-4.9/gcc/doc/invoke.texi index 2fb008d42..ed64aae13 100644 --- a/gcc-4.9/gcc/doc/invoke.texi +++ b/gcc-4.9/gcc/doc/invoke.texi @@ -488,6 +488,7 @@ Objective-C and Objective-C++ Dialects}. -mstrict-align @gol -momit-leaf-frame-pointer -mno-omit-leaf-frame-pointer @gol -mtls-dialect=desc -mtls-dialect=traditional @gol +-mfix-cortex-a53-835769 -mno-fix-cortex-a53-835769 @gol -march=@var{name} -mcpu=@var{name} -mtune=@var{name}} @emph{Adapteva Epiphany Options} @@ -11699,6 +11700,14 @@ of TLS variables. This is the default. Use traditional TLS as the thread-local storage mechanism for dynamic accesses of TLS variables. +@item -mfix-cortex-a53-835769 +@itemx -mno-fix-cortex-a53-835769 +@opindex -mfix-cortex-a53-835769 +@opindex -mno-fix-cortex-a53-835769 +Enable or disable the workaround for the ARM Cortex-A53 erratum number 835769. +This will involve inserting a NOP instruction between memory instructions and +64-bit integer multiply-accumulate instructions. + @item -march=@var{name} @opindex march Specify the name of the target architecture, optionally suffixed by one or |