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48 lines
2.6 KiB
Diff
48 lines
2.6 KiB
Diff
From 9140ce712aa87091613874d802787ab476be0e39 Mon Sep 17 00:00:00 2001
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From: Michael Catanzaro <mcatanzaro@redhat.com>
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Date: Wed, 14 Aug 2024 14:58:05 -0500
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Subject: [PATCH] Revert "Cherry-pick 272448.770@safari-7618-branch
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(6d311cd7fefc). https://bugs.webkit.org/show_bug.cgi?id=271175"
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https://bugs.webkit.org/show_bug.cgi?id=278113
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This reverts commit 279c9d7963182cc35cf4e0bfebe87df2d83eaef8.
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This broke wasm, and I don't know how to fix it.
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Canonical link: https://commits.webkit.org/274313.373@webkitglib/2.44
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---
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.../stress/many-calls-results-on-stack.js | 39 -------------------
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Source/JavaScriptCore/wasm/WasmBBQJIT.cpp | 19 ---------
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2 files changed, 58 deletions(-)
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delete mode 100644 JSTests/wasm/stress/many-calls-results-on-stack.js
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index 9049865e8ce7..3f142cf5e90f 100644
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--- a/Source/JavaScriptCore/wasm/WasmBBQJIT.cpp
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+++ b/Source/JavaScriptCore/wasm/WasmBBQJIT.cpp
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@@ -3958,25 +3958,6 @@ void BBQJIT::returnValuesFromCall(Vector<Value, N>& results, const FunctionSigna
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ASSERT(m_validFPRs.contains(returnLocation.asFPR(), Width::Width128));
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m_fprSet.add(returnLocation.asFPR(), Width::Width128);
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}
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- } else {
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- ASSERT(returnLocation.isStackArgument());
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- // FIXME: Ideally, we would leave these values where they are but a subsequent call could clobber them before they are used.
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- // That said, stack results are very rare so this isn't too painful.
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- // Even if we did leave them where they are, we'd need to flush them to their canonical location at the next branch otherwise
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- // we could have something like (assume no result regs for simplicity):
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- // call (result i32 i32) $foo
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- // if (result i32) // Stack: i32(StackArgument:8) i32(StackArgument:0)
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- // // Stack: i32(StackArgument:8)
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- // else
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- // call (result i32 i32) $bar // Stack: i32(StackArgument:8) we have to flush the stack argument to make room for the result of bar
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- // drop // Stack: i32(Stack:X) i32(StackArgument:8) i32(StackArgument:0)
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- // drop // Stack: i32(Stack:X) i32(StackArgument:8)
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- // end
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- // return // Stack i32(*Conflicting locations*)
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-
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- Location canonicalLocation = canonicalSlot(result);
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- emitMoveMemory(result.type(), returnLocation, canonicalLocation);
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- returnLocation = canonicalLocation;
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}
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}
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bind(result, returnLocation);
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