[llvm] 3b5ff3a - [InlineCost] isKnownNonNullInCallee - handle also dereferenceable attribute
Dávid Bolvanský via llvm-commits
llvm-commits at lists.llvm.org
Thu Apr 6 07:51:58 PDT 2023
Author: Dávid Bolvanský
Date: 2023-04-06T16:51:28+02:00
New Revision: 3b5ff3a67c1f0450a100dca34d899ecd3744cb36
URL: https://github.com/llvm/llvm-project/commit/3b5ff3a67c1f0450a100dca34d899ecd3744cb36
DIFF: https://github.com/llvm/llvm-project/commit/3b5ff3a67c1f0450a100dca34d899ecd3744cb36.diff
LOG: [InlineCost] isKnownNonNullInCallee - handle also dereferenceable attribute
Added:
Modified:
llvm/lib/Analysis/InlineCost.cpp
llvm/test/Transforms/Inline/nonnull.ll
Removed:
################################################################################
diff --git a/llvm/lib/Analysis/InlineCost.cpp b/llvm/lib/Analysis/InlineCost.cpp
index 6877e44813f56..1eb4f2efb5a38 100644
--- a/llvm/lib/Analysis/InlineCost.cpp
+++ b/llvm/lib/Analysis/InlineCost.cpp
@@ -1732,7 +1732,7 @@ bool CallAnalyzer::isKnownNonNullInCallee(Value *V) {
// parameter attribute, but that's a less interesting case because hopefully
// the callee would already have been simplified based on that.
if (Argument *A = dyn_cast<Argument>(V))
- if (paramHasAttr(A, Attribute::NonNull))
+ if (paramHasAttr(A, Attribute::NonNull) || paramHasAttr(A, Attribute::Dereferenceable))
return true;
// Is this an alloca in the caller? This is distinct from the attribute case
diff --git a/llvm/test/Transforms/Inline/nonnull.ll b/llvm/test/Transforms/Inline/nonnull.ll
index 5f8af7f78fde7..658ae47954ee1 100644
--- a/llvm/test/Transforms/Inline/nonnull.ll
+++ b/llvm/test/Transforms/Inline/nonnull.ll
@@ -99,10 +99,11 @@ define void @caller3(ptr %arg) {
ret void
}
+; Positive test - arg is known non null
define void @caller4(ptr dereferenceable(8) %arg) {
; CHECK-LABEL: define void @caller4
; CHECK-SAME: (ptr dereferenceable(8) [[ARG:%.*]]) {
-; CHECK-NEXT: call void @callee(ptr dereferenceable(8) [[ARG]])
+; CHECK-NEXT: call void @bar()
; CHECK-NEXT: ret void
;
call void @callee(ptr dereferenceable(8) %arg)
@@ -122,7 +123,24 @@ define void @caller5(ptr dereferenceable(8) %arg) {
define void @caller6(ptr %arg) {
; CHECK-LABEL: define void @caller6
; CHECK-SAME: (ptr [[ARG:%.*]]) {
-; CHECK-NEXT: call void @callee(ptr dereferenceable(8) [[ARG]])
+; CHECK-NEXT: [[CMP_I:%.*]] = icmp eq ptr [[ARG]], null
+; CHECK-NEXT: br i1 [[CMP_I]], label [[EXPENSIVE_I:%.*]], label [[DONE_I:%.*]]
+; CHECK: expensive.i:
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: call void @foo()
+; CHECK-NEXT: br label [[CALLEE_EXIT:%.*]]
+; CHECK: done.i:
+; CHECK-NEXT: call void @bar()
+; CHECK-NEXT: br label [[CALLEE_EXIT]]
+; CHECK: callee.exit:
; CHECK-NEXT: ret void
;
call void @callee(ptr dereferenceable(8) %arg)
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