[llvm] [X86] getConstantFromPool - add basic handling for non-zero address offsets (PR #127225)

[Phoebe Wang via llvm-commits]

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@@ -139,20 +139,33 @@ static std::optional<APInt> extractConstantBits(const Constant *C) {
 }
 
 static std::optional<APInt> extractConstantBits(const Constant *C,
-                                                unsigned NumBits) {
+                                                int64_t ByteOffset) {
+  int64_t BitOffset = ByteOffset * 8;
   if (std::optional<APInt> Bits = extractConstantBits(C))
+    return Bits->extractBits(Bits->getBitWidth() - BitOffset, BitOffset);
+  return std::nullopt;
+}
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phoebewang wrote:

Is there any more use of this function?

https://github.com/llvm/llvm-project/pull/127225