[clang] MIPS/Clang: Set HasUnalignedAccess false if +strict-align (PR #87257)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: YunQiang Su (wzssyqa)

<details>
<summary>Changes</summary>

TargetInfo has HasUnalignedAccess support now. For MIPSr6, we should set it according strict-align.

For pre-R6, we always set strict-align and HasUnalignedAccess to false.

---
Full diff: https://github.com/llvm/llvm-project/pull/87257.diff


1 Files Affected:

- (modified) clang/lib/Basic/Targets/Mips.h (+6) 


``````````diff
diff --git a/clang/lib/Basic/Targets/Mips.h b/clang/lib/Basic/Targets/Mips.h
index c9dcf434c93b0b..f5ce1bc735a700 100644
--- a/clang/lib/Basic/Targets/Mips.h
+++ b/clang/lib/Basic/Targets/Mips.h
@@ -318,6 +318,7 @@ class LLVM_LIBRARY_VISIBILITY MipsTargetInfo : public TargetInfo {
     FPMode = isFP64Default() ? FP64 : FPXX;
     NoOddSpreg = false;
     bool OddSpregGiven = false;
+    bool StrictAlign = false;
 
     for (const auto &Feature : Features) {
       if (Feature == "+single-float")
@@ -330,6 +331,8 @@ class LLVM_LIBRARY_VISIBILITY MipsTargetInfo : public TargetInfo {
         IsMicromips = true;
       else if (Feature == "+mips32r6" || Feature == "+mips64r6")
         HasUnalignedAccess = true;
+      else if (Feature == "+strict-align")
+        StrictAlign = true;
       else if (Feature == "+dsp")
         DspRev = std::max(DspRev, DSP1);
       else if (Feature == "+dspr2")
@@ -368,6 +371,9 @@ class LLVM_LIBRARY_VISIBILITY MipsTargetInfo : public TargetInfo {
     if (FPMode == FPXX && !OddSpregGiven)
       NoOddSpreg = true;
 
+    if (StrictAlign)
+      HasUnalignedAccess = false;
+
     setDataLayout();
 
     return true;

``````````

</details>


https://github.com/llvm/llvm-project/pull/87257