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Improve performance of bitscanning intrinsics

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This change helps spectre more intelligently plan execution, by working
around false output dependencies, impacting ops like popcnt bsr and bsf
This commit is contained in:
Justine Tunney 2021-06-15 06:24:46 -07:00
parent 29cb53881e
commit 87d7010495
13 changed files with 100 additions and 224 deletions
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3
test/net/http/hascontrolcodes_test.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/testlib/blocktronics.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/hyperion.h"
#include "libc/testlib/testlib.h"
@ -48,4 +49,6 @@ BENCH(HasControlCodes, bench) {
EZBENCH2("HasControlCodes small", donothing, HasControlCodes("hello", -1, 0));
EZBENCH2("HasControlCodes big", donothing,
HasControlCodes(kHyperion, kHyperionSize, kControlC1));
EZBENCH2("HasControlCodes unicode", donothing,
HasControlCodes(kBlocktronics, kBlocktronicsSize, kControlC1));
}