[PATCH] C API: implement LLVM{Get,Set}InstructionAlignment

[Peter Zotov]

  Modify existing LLVM{Get,Set}Alignment functions to work on load/store instructions.

http://llvm-reviews.chandlerc.com/D1910

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1910?vs=4862&id=4973#toc

Files:
  include/llvm-c/Core.h
  lib/IR/Core.cpp

Index: include/llvm-c/Core.h
===================================================================
--- include/llvm-c/Core.h
+++ include/llvm-c/Core.h
@@ -1626,8 +1626,6 @@
 void LLVMSetSection(LLVMValueRef Global, const char *Section);
 LLVMVisibility LLVMGetVisibility(LLVMValueRef Global);
 void LLVMSetVisibility(LLVMValueRef Global, LLVMVisibility Viz);
-unsigned LLVMGetAlignment(LLVMValueRef Global);
-void LLVMSetAlignment(LLVMValueRef Global, unsigned Bytes);
 
 /**
  * @defgroup LLVMCoreValueConstantGlobalVariable Global Variables
@@ -2339,6 +2337,24 @@
  */
 
 /**
+ * @defgroup LLVMCCoreValueWithAlignment Values with alignment
+ *
+ * Functions in this group only apply to values with alignment, i.e.
+ * global variables, load and store instructions.
+ */
+
+/**
+ * Obtain the preferred alignment of the value.
+ */
+unsigned LLVMGetAlignment(LLVMValueRef V);
+
+/**
+ * Set the preferred alignment of the value.
+ */
+void LLVMSetAlignment(LLVMValueRef V, unsigned Bytes);
+
+
+/**
  * @}
  */
 
Index: lib/IR/Core.cpp
===================================================================
--- lib/IR/Core.cpp
+++ lib/IR/Core.cpp
@@ -1216,14 +1216,6 @@
     ->setVisibility(static_cast<GlobalValue::VisibilityTypes>(Viz));
 }
 
-unsigned LLVMGetAlignment(LLVMValueRef Global) {
-  return unwrap<GlobalValue>(Global)->getAlignment();
-}
-
-void LLVMSetAlignment(LLVMValueRef Global, unsigned Bytes) {
-  unwrap<GlobalValue>(Global)->setAlignment(Bytes);
-}
-
 /*--.. Operations on global variables ......................................--*/
 
 LLVMValueRef LLVMAddGlobal(LLVMModuleRef M, LLVMTypeRef Ty, const char *Name) {
@@ -1813,6 +1805,32 @@
   return wrap(unwrap<PHINode>(PhiNode)->getIncomingBlock(Index));
 }
 
+/*--.. Operations on global variables, load and store instructions .........--*/
+
+unsigned LLVMGetAlignment(LLVMValueRef V) {
+  Value *P = unwrap<Value>(V);
+  if (GlobalValue* GV = dyn_cast<GlobalValue>(P))
+    return GV->getAlignment();
+  if (LoadInst *LI = dyn_cast<LoadInst>(P))
+    return LI->getAlignment();
+  if (StoreInst *SI = dyn_cast<StoreInst>(P))
+    return SI->getAlignment();
+
+  llvm_unreachable("only GlobalValue, LoadInst and StoreInst have alignment");
+}
+
+void LLVMSetAlignment(LLVMValueRef V, unsigned Bytes) {
+  Value *P = unwrap<Value>(V);
+  if (GlobalValue* GV = dyn_cast<GlobalValue>(P))
+    GV->setAlignment(Bytes);
+  else if (LoadInst *LI = dyn_cast<LoadInst>(P))
+    LI->setAlignment(Bytes);
+  else if (StoreInst *SI = dyn_cast<StoreInst>(P))
+    SI->setAlignment(Bytes);
+  else
+    llvm_unreachable("only GlobalValue, LoadInst and StoreInst have alignment");
+}
+
 
 /*===-- Instruction builders ----------------------------------------------===*/
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