Changeset 243330 in webkit for trunk/Source/JavaScriptCore/b3/B3Opcode.h

Timestamp:

Mar 21, 2019, 2:36:26 PM (6 years ago)

Author:

[email protected]

Message:

B3::Opcode can fit in a single byte, shrinking B3Value by 8 bytes
​https://bugs.webkit.org/show_bug.cgi?id=196014

Reviewed by Keith Miller.

B3::Opcode has less than one hundred cases, so it can easily fit in one byte (from two currently)
This shrinks B3::Kind from 4 bytes to 2 (by removing the byte of padding at the end).
This in turns eliminate padding from B3::Value, shrinking it by 8 bytes (out of 80).

• b3/B3Opcode.h:

File:

• trunk/Source/JavaScriptCore/b3/B3Opcode.h (modified) (1 diff)

trunk/Source/JavaScriptCore/b3/B3Opcode.h

@@ -38 +38 @@
 // would be used in simple IRs. See B3Kind.h.
 
-enum Opcode : int16_t {
+enum Opcode : uint8_t {
     // A no-op that returns Void, useful for when you want to remove a value.
     Nop,