runtime/platform/utils.h - Issue 712993005: Infer range for BIT_XOR.

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Unified Diff: runtime/platform/utils.h

Issue 712993005: Infer range for BIT_XOR. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart

Patch Set: Created 6 years, 1 month ago

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Index: runtime/platform/utils.h

diff --git a/runtime/platform/utils.h b/runtime/platform/utils.h

index a46db44cb79a5f7c4668b85d827f704c91233172..8eff2f47062049572ef32b983763daa8f6f04343 100644

--- a/runtime/platform/utils.h

+++ b/runtime/platform/utils.h

@@ -81,6 +81,12 @@ class Utils {

static int HighestBit(int64_t v);

+ static int BitLength(int64_t value) {

+ // Flip bits if negative (-1 becomes 0).

+ value ^= value >> (8 * sizeof(value) - 1);

+ return (value == 0) ? 0 : (Utils::HighestBit(value) + 1);

+ }

static int CountLeadingZeros(uword x);

static int CountTrailingZeros(uword x);

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