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| author | Terry Guo <terry.guo@arm.com> | 2013-11-25 06:41:20 +0000 |
|---|---|---|
| committer | Xuepeng Guo <xguo@gcc.gnu.org> | 2013-11-25 06:41:20 +0000 |
| commit | 02231c13506fcbd63be93bba1215211bcbd1024c (patch) | |
| tree | b045e1d8d7d9e61ea7b8d4e8262360a69c3e0632 /gcc/doc | |
| parent | 36ef4e9d585a929f0423adc30c2076d6bb445c4a (diff) | |
| download | gcc-02231c13506fcbd63be93bba1215211bcbd1024c.zip gcc-02231c13506fcbd63be93bba1215211bcbd1024c.tar.gz gcc-02231c13506fcbd63be93bba1215211bcbd1024c.tar.bz2 | |
invoke.texi (-mslow-flash-data): Document new option.
gcc/ChangeLog
2013-11-25 Terry Guo <terry.guo@arm.com>
* doc/invoke.texi (-mslow-flash-data): Document new option.
* config/arm/arm.opt (mslow-flash-data): New option.
* config/arm/arm-protos.h (arm_max_const_double_inline_cost): Declare
it.
* config/arm/arm.h (TARGET_USE_MOVT): Always true when literal pools
are disabled.
(arm_disable_literal_pool): Declare it.
* config/arm/arm.c (arm_disable_literal_pool): New variable.
(arm_option_override): Handle new option.
(thumb2_legitimate_address_p): Don't allow symbol references when
literal pools are disabled.
(arm_max_const_double_inline_cost): New function.
* config/arm/arm.md (types.md): Include it before ...
(use_literal_pool): New attribute.
(enabled): Use new attribute.
(split pattern): Replace symbol+offset with MOVW/MOVT.
gcc/testsuite/ChangeLog
2013-11-25 Terry Guo <terry.guo@arm.com>
* gcc.target/arm/thumb2-slow-flash-data.c: New.
From-SVN: r205342
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 568c90d..501d080 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -533,6 +533,7 @@ Objective-C and Objective-C++ Dialects}. -mfix-cortex-m3-ldrd @gol -munaligned-access @gol -mneon-for-64bits @gol +-mslow-flash-data @gol -mrestrict-it} @emph{AVR Options} @@ -12345,6 +12346,13 @@ Enables using Neon to handle scalar 64-bits operations. This is disabled by default since the cost of moving data from core registers to Neon is high. +@item -mslow-flash-data +@opindex mslow-flash-data +Assume loading data from flash is slower than fetching instruction. +Therefore literal load is minimized for better performance. +This option is only supported when compiling for ARMv7 M-profile and +off by default. + @item -mrestrict-it @opindex mrestrict-it Restricts generation of IT blocks to conform to the rules of ARMv8. |