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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2021-10-20 13:16:54 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2021-10-20 13:38:12 +0100 |
| commit | 9c751b88def09f71e1edbf623d41776478ead6fd (patch) | |
| tree | 023d04d68dfc1481483bb0dc2d736f239c51e655 /gcc | |
| parent | c437d3340d21c0c47537aca91e3546d2d6f1ae02 (diff) | |
| download | gcc-9c751b88def09f71e1edbf623d41776478ead6fd.zip gcc-9c751b88def09f71e1edbf623d41776478ead6fd.tar.gz gcc-9c751b88def09f71e1edbf623d41776478ead6fd.tar.bz2 | |
AArch64: Tune case-values-threshold
Tune the case-values-threshold setting for modern cores. A value of 11 improves
SPECINT2017 by 0.2% and reduces codesize by 0.04%. With -Os use value 8 which
reduces codesize by 0.07%.
2021-10-18 Wilco Dijkstra <wdijkstr@arm.com>
gcc/
* config/aarch64/aarch64.c (aarch64_case_values_threshold):
Change to 8 with -Os, 11 otherwise.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/aarch64/aarch64.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 1d53c71..674edd4e 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -9500,8 +9500,8 @@ aarch64_cannot_force_const_mem (machine_mode mode ATTRIBUTE_UNUSED, rtx x) The expansion for a table switch is quite expensive due to the number of instructions, the table lookup and hard to predict indirect jump. When optimizing for speed, and -O3 enabled, use the per-core tuning if - set, otherwise use tables for > 16 cases as a tradeoff between size and - performance. When optimizing for size, use the default setting. */ + set, otherwise use tables for >= 11 cases as a tradeoff between size and + performance. When optimizing for size, use 8 for smallest codesize. */ static unsigned int aarch64_case_values_threshold (void) @@ -9512,7 +9512,7 @@ aarch64_case_values_threshold (void) && selected_cpu->tune->max_case_values != 0) return selected_cpu->tune->max_case_values; else - return optimize_size ? default_case_values_threshold () : 17; + return optimize_size ? 8 : 11; } /* Return true if register REGNO is a valid index register. |