[llvm] [CodeGen] Use round-down algorithm for uncooperative constants (PR #99666)

[via llvm-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff 9da9127fec7b0a252b80d60b09b8c0ccedb41672 b401c547d4442915022c39a041b49f6977a4fa72 --extensions h,cpp -- llvm/include/llvm/Support/DivisionByConstantInfo.h llvm/lib/Support/DivisionByConstantInfo.cpp llvm/unittests/Support/DivisionByConstantTest.cpp
``````````

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/llvm/lib/Support/DivisionByConstantInfo.cpp b/llvm/lib/Support/DivisionByConstantInfo.cpp
index 6290cb91cb..1f05497144 100644
--- a/llvm/lib/Support/DivisionByConstantInfo.cpp
+++ b/llvm/lib/Support/DivisionByConstantInfo.cpp
@@ -71,7 +71,8 @@ SignedDivisionByConstantInfo SignedDivisionByConstantInfo::get(const APInt &D) {
 /// LeadingZeros can be used to simplify the calculation if the upper bits
 /// of the divided value are known zero.
 
-static UnsignedDivisionByConstantInfo get2(const APInt &D, unsigned LeadingZeros) {
+static UnsignedDivisionByConstantInfo get2(const APInt &D,
+                                           unsigned LeadingZeros) {
   assert(!D.isZero() && !D.isOne() && "Precondition violation.");
   assert(D.getBitWidth() > 1 && "Does not work at smaller bitwidths.");
 
@@ -207,7 +208,7 @@ UnsignedDivisionByConstantInfo::get(const APInt &D, unsigned LeadingZeros) {
     Retval.PostShift = Exponent;
     Retval.IsAdd = false;
   } else if (!D[0]) {
-    // 
+    //
     Retval.Magic = MultiplierRoundDown;
     Retval.PreShift = 0;
     Retval.PostShift = ExponentRoundDown;
@@ -223,4 +224,3 @@ UnsignedDivisionByConstantInfo::get(const APInt &D, unsigned LeadingZeros) {
 
   return Retval;
 }
-

``````````

</details>


https://github.com/llvm/llvm-project/pull/99666