[PATCH] D149768: [ArgumentPromotion] Bail if any callers are minsize
Arthur Eubanks via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed May 3 11:29:46 PDT 2023
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG8b8466fd31e5: [ArgumentPromotion] Bail if any callers are minsize (authored by aeubanks).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D149768/new/
https://reviews.llvm.org/D149768
Files:
llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
llvm/test/Transforms/ArgumentPromotion/minsize.ll
Index: llvm/test/Transforms/ArgumentPromotion/minsize.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/ArgumentPromotion/minsize.ll
@@ -0,0 +1,63 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; RUN: opt -passes=argpromotion -S < %s | FileCheck %s
+
+define internal i32 @f1(ptr %p) {
+; CHECK-LABEL: define internal i32 @f1
+; CHECK-SAME: (i32 [[P_0_VAL:%.*]]) {
+; CHECK-NEXT: ret i32 [[P_0_VAL]]
+;
+ %i = load i32, ptr %p
+ ret i32 %i
+}
+
+define i32 @g1(ptr %p) {
+; CHECK-LABEL: define i32 @g1
+; CHECK-SAME: (ptr [[P:%.*]]) {
+; CHECK-NEXT: [[P_VAL:%.*]] = load i32, ptr [[P]], align 4
+; CHECK-NEXT: [[I:%.*]] = call i32 @f1(i32 [[P_VAL]])
+; CHECK-NEXT: ret i32 [[I]]
+;
+ %i = call i32 @f1(ptr %p)
+ ret i32 %i
+}
+
+define i32 @g2(ptr %p) {
+; CHECK-LABEL: define i32 @g2
+; CHECK-SAME: (ptr [[P:%.*]]) {
+; CHECK-NEXT: [[P_VAL:%.*]] = load i32, ptr [[P]], align 4
+; CHECK-NEXT: [[I:%.*]] = call i32 @f1(i32 [[P_VAL]])
+; CHECK-NEXT: ret i32 [[I]]
+;
+ %i = call i32 @f1(ptr %p)
+ ret i32 %i
+}
+
+define internal i32 @f2(ptr %p) {
+; CHECK-LABEL: define internal i32 @f2
+; CHECK-SAME: (ptr [[P:%.*]]) {
+; CHECK-NEXT: [[I:%.*]] = load i32, ptr [[P]], align 4
+; CHECK-NEXT: ret i32 [[I]]
+;
+ %i = load i32, ptr %p
+ ret i32 %i
+}
+
+define i32 @h1(ptr %p) minsize {
+; CHECK-LABEL: define i32 @h1
+; CHECK-SAME: (ptr [[P:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-NEXT: [[I:%.*]] = call i32 @f2(ptr [[P]])
+; CHECK-NEXT: ret i32 [[I]]
+;
+ %i = call i32 @f2(ptr %p)
+ ret i32 %i
+}
+
+define i32 @h2(ptr %p) {
+; CHECK-LABEL: define i32 @h2
+; CHECK-SAME: (ptr [[P:%.*]]) {
+; CHECK-NEXT: [[I:%.*]] = call i32 @f2(ptr [[P]])
+; CHECK-NEXT: ret i32 [[I]]
+;
+ %i = call i32 @f2(ptr %p)
+ ret i32 %i
+}
Index: llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
===================================================================
--- llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -764,6 +764,15 @@
if (CB->isMustTailCall())
return nullptr;
+ // If the caller is marked minsize, this transformation may increase code
+ // size. We assume that there is more than one call to this function since
+ // otherwise this function would be inlined or is dead.
+ // TODO: compare the number of loads/stores removed from the function with
+ // the number of introduced loads in callees to see if this is profitable
+ // code-size-wise.
+ if (CB->getFunction()->hasMinSize())
+ return nullptr;
+
if (CB->getFunction() == F)
IsRecursive = true;
}
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