[compiler-rt] [MemProf][NFC] Compute SHADOW_ENTRY_SIZE from MEM_GRANULARITY and SHA… (PR #80589)

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llvmbot wrote:


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@llvm/pr-subscribers-pgo

Author: Enna1 (Enna1)

<details>
<summary>Changes</summary>

…DOW_SCALE

As MEM_GRANULARITY represents the size of memory block mapped to a single shadow entry, and SHADOW_SCALE represents the scale of shadow mapping, so the single shadow entry size can be computed as (MEM_GRANULARITY >> SHADOW_SCALE).

This patch replaces the hardcoded SHADOW_ENTRY_SIZE with (MEM_GRANULARITY >> SHADOW_SCALE).

---
Full diff: https://github.com/llvm/llvm-project/pull/80589.diff


1 Files Affected:

- (modified) compiler-rt/lib/memprof/memprof_mapping.h (+2-2) 


``````````diff
diff --git a/compiler-rt/lib/memprof/memprof_mapping.h b/compiler-rt/lib/memprof/memprof_mapping.h
index ba05b88db3070..1cc0836834cdf 100644
--- a/compiler-rt/lib/memprof/memprof_mapping.h
+++ b/compiler-rt/lib/memprof/memprof_mapping.h
@@ -29,8 +29,6 @@ extern uptr kHighMemEnd; // Initialized in __memprof_init.
 
 } // namespace __memprof
 
-#define SHADOW_ENTRY_SIZE 8
-
 // Size of memory block mapped to a single shadow location
 #define MEM_GRANULARITY 64ULL
 
@@ -39,6 +37,8 @@ extern uptr kHighMemEnd; // Initialized in __memprof_init.
 #define MEM_TO_SHADOW(mem)                                                     \
   ((((mem) & SHADOW_MASK) >> SHADOW_SCALE) + (SHADOW_OFFSET))
 
+#define SHADOW_ENTRY_SIZE (MEM_GRANULARITY >> SHADOW_SCALE)
+
 #define kLowMemBeg 0
 #define kLowMemEnd (SHADOW_OFFSET ? SHADOW_OFFSET - 1 : 0)
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/80589