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Adding noalias attribute to malloc return

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This commit is contained in:
Dmitry Babokin
2013-04-25 20:39:01 +04:00
parent 65ac336211
commit d36ab4cc3c
2 changed files with 19 additions and 5 deletions
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10
builtins/util.m4
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@@ -2536,11 +2536,11 @@ ok:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; new/delete
declare i8 * @malloc(i64)
declare noalias i8 * @malloc(i64)
declare void @free(i8 *)
define i8 * @__new_uniform(i64 %size) {
%a = call i8 * @malloc(i64 %size)
define noalias i8 * @__new_uniform(i64 %size) {
%a = call noalias i8 * @malloc(i64 %size)
ret i8 * %a
}
@@ -2552,7 +2552,7 @@ define <WIDTH x i64> @__new_varying32(<WIDTH x i32> %size, <WIDTH x MASK> %mask)
per_lane(WIDTH, <WIDTH x MASK> %mask, `
%sz_LANE_ID = extractelement <WIDTH x i32> %size, i32 LANE
%sz64_LANE_ID = zext i32 %sz_LANE_ID to i64
%ptr_LANE_ID = call i8 * @malloc(i64 %sz64_LANE_ID)
%ptr_LANE_ID = call noalias i8 * @malloc(i64 %sz64_LANE_ID)
%ptr_int_LANE_ID = ptrtoint i8 * %ptr_LANE_ID to i64
%store_LANE_ID = getelementptr i64 * %ret64, i32 LANE
store i64 %ptr_int_LANE_ID, i64 * %store_LANE_ID')
@@ -2568,7 +2568,7 @@ define <WIDTH x i64> @__new_varying64(<WIDTH x i64> %size, <WIDTH x MASK> %mask)
per_lane(WIDTH, <WIDTH x MASK> %mask, `
%sz_LANE_ID = extractelement <WIDTH x i64> %size, i32 LANE
%ptr_LANE_ID = call i8 * @malloc(i64 %sz_LANE_ID)
%ptr_LANE_ID = call noalias i8 * @malloc(i64 %sz_LANE_ID)
%ptr_int_LANE_ID = ptrtoint i8 * %ptr_LANE_ID to i64
%store_LANE_ID = getelementptr i64 * %ret64, i32 LANE
store i64 %ptr_int_LANE_ID, i64 * %store_LANE_ID')

14
ctx.cpp
View File

@@ -3285,6 +3285,20 @@ FunctionEmitContext::CallInst(llvm::Value *func, const FunctionType *funcType,
// pointer, so just emit the IR directly.
llvm::Instruction *ci =
llvm::CallInst::Create(func, argVals, name ? name : "", bblock);
// Copy noalias attribute to call instruction, to enable better
// alias analysis.
// TODO: what other attributes needs to be copied?
// TODO: do the same for varing path.
#if defined (LLVM_3_3)
llvm::CallInst *cc = llvm::dyn_cast<llvm::CallInst>(ci);
if (cc &&
cc->getCalledFunction() &&
cc->getCalledFunction()->doesNotAlias(0)) {
cc->addAttribute(0, llvm::Attribute::NoAlias);
}
#endif
AddDebugPos(ci);
return ci;
}