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From a89c562f9389fdc2bb1356d3da782d0063951e14 Mon Sep 17 00:00:00 2001
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From: Jan Vorlicek <jan.vorlicek@volny.cz>
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Date: Tue, 30 Nov 2021 10:55:21 +0100
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Subject: [PATCH] Fix clang 13 induced runtime issues (#62170)
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The clang 13 optimizer started to assume that "this" pointer is always
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properly aligned. That lead to elimination of some code that was actually
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needed.
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It also takes pointer aliasing rules more strictly in one place in jit.
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That caused the optimizer to falsely assume that a callee with an argument
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passed by reference is not modifying that argument and used a stale
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copy of the original value at the caller site.
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This change fixes both of the issues. With this fix, runtime compiled
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using clang 13 seems to be fully functional.
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---
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src/coreclr/src/inc/corhlpr.h | 8 ++++----
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src/coreclr/src/jit/bitsetasshortlong.h | 4 ++--
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2 files changed, 6 insertions(+), 6 deletions(-)
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diff --git a/src/coreclr/src/inc/corhlpr.h b/src/coreclr/src/inc/corhlpr.h
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index 450514da95c..427e8cdc0ff 100644
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--- a/src/coreclr/src/inc/corhlpr.h
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+++ b/src/coreclr/src/inc/corhlpr.h
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@@ -336,7 +336,7 @@ struct COR_ILMETHOD_SECT
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const COR_ILMETHOD_SECT* Next() const
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{
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if (!More()) return(0);
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- return ((COR_ILMETHOD_SECT*)(((BYTE *)this) + DataSize()))->Align();
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+ return ((COR_ILMETHOD_SECT*)Align(((BYTE *)this) + DataSize()));
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}
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const BYTE* Data() const
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@@ -374,9 +374,9 @@ struct COR_ILMETHOD_SECT
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return((AsSmall()->Kind & CorILMethod_Sect_FatFormat) != 0);
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}
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- const COR_ILMETHOD_SECT* Align() const
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+ static const void* Align(const void* p)
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{
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- return((COR_ILMETHOD_SECT*) ((((UINT_PTR) this) + 3) & ~3));
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+ return((void*) ((((UINT_PTR) p) + 3) & ~3));
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}
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protected:
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@@ -579,7 +579,7 @@ typedef struct tagCOR_ILMETHOD_FAT : IMAGE_COR_ILMETHOD_FAT
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const COR_ILMETHOD_SECT* GetSect() const {
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if (!More()) return (0);
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- return(((COR_ILMETHOD_SECT*) (GetCode() + GetCodeSize()))->Align());
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+ return(((COR_ILMETHOD_SECT*) COR_ILMETHOD_SECT::Align(GetCode() + GetCodeSize())));
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}
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} COR_ILMETHOD_FAT;
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diff --git a/src/coreclr/src/jit/bitsetasshortlong.h b/src/coreclr/src/jit/bitsetasshortlong.h
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index 078cdc810e9..4c52819853f 100644
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--- a/src/coreclr/src/jit/bitsetasshortlong.h
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+++ b/src/coreclr/src/jit/bitsetasshortlong.h
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@@ -345,7 +345,7 @@ public:
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{
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if (IsShort(env))
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{
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- (size_t&)out = (size_t)out & ((size_t)gen | (size_t)in);
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+ out = (BitSetShortLongRep)((size_t)out & ((size_t)gen | (size_t)in));
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}
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else
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{
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@@ -361,7 +361,7 @@ public:
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{
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if (IsShort(env))
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{
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- (size_t&)in = (size_t)use | ((size_t)out & ~(size_t)def);
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+ in = (BitSetShortLongRep)((size_t)use | ((size_t)out & ~(size_t)def));
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}
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else
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{
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--
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2.33.1
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