Changeset 251966 in webkit for trunk/Source/JavaScriptCore/offlineasm/mips.rb

Timestamp:

Nov 2, 2019, 1:12:38 PM (6 years ago)

Author:

[email protected]

Message:

The offline assembler is wrong about which immediates are supported by and/or/xor on ARM64
​https://bugs.webkit.org/show_bug.cgi?id=203752

Reviewed by Tadeu Zagallo.

See ​https://dinfuehr.github.io/blog/encoding-of-immediate-values-on-aarch64/ for the details of which immediates are supported.
This patch is a minimal fix, ideally we should refactor all of the code dealing with immediates in risc.rb, but considering that I don't know ruby and this code is poorly/not tested, I went for the simplest possible fix.

• offlineasm/arm64.rb:
• offlineasm/mips.rb:
• offlineasm/risc.rb:

File:

• trunk/Source/JavaScriptCore/offlineasm/mips.rb (modified) (1 diff)

trunk/Source/JavaScriptCore/offlineasm/mips.rb

@@ -730 +730 @@
         result = riscLowerMisplacedImmediates(result, ["storeb", "storei", "storep"])
         result = mipsLowerMisplacedImmediates(result)
-        result = riscLowerMalformedImmediates(result, -0x7fff..0x7fff)
+        result = riscLowerMalformedImmediates(result, -0x7fff..0x7fff, -0x7fff..0x7fff)
         result = mipsLowerMisplacedAddresses(result)
         result = riscLowerMisplacedAddresses(result)