https://github.com/markoshorro updated
https://github.com/llvm/llvm-project/pull/71072
>From 0c5299adb30888aa0dfd7c3106547a69606d5ab1 Mon Sep 17 00:00:00 2001
From: Marcos Horro <marc...@amd.com>
Date: Thu, 2 Nov 2023 15:35:07 +0000
Subject: [PATCH 1/2] [IndVars] Truncation also considered as bitcast
optimization
---
llvm/lib/Transforms/Utils/SimplifyIndVar.cpp | 5 ++--
.../Transforms/IndVarSimplify/casted-trunc.ll | 28 +++++++++++++++++++
2 files changed, 31 insertions(+), 2 deletions(-)
create mode 100644 llvm/test/Transforms/IndVarSimplify/casted-trunc.ll
diff --git a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
index a23ac41acaa58aa..740f726cb06b148 100644
--- a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
@@ -908,8 +908,9 @@ void SimplifyIndvar::simplifyUsers(PHINode *CurrIV,
IVVisitor *V) {
if (replaceIVUserWithLoopInvariant(UseInst))
continue;
- // Go further for the bitcast ''prtoint ptr to i64'
- if (isa<PtrToIntInst>(UseInst))
+ // Go further for the bitcast 'prtoint ptr to i64' or if the cast is done
+ // by truncation
+ if ((isa<PtrToIntInst>(UseInst)) || (isa<TruncInst>(UseInst)))
for (Use &U : UseInst->uses()) {
Instruction *User = cast<Instruction>(U.getUser());
if (replaceIVUserWithLoopInvariant(User))
diff --git a/llvm/test/Transforms/IndVarSimplify/casted-trunc.ll
b/llvm/test/Transforms/IndVarSimplify/casted-trunc.ll
new file mode 100644
index 000000000000000..ef9db0b5774dada
--- /dev/null
+++ b/llvm/test/Transforms/IndVarSimplify/casted-trunc.ll
@@ -0,0 +1,28 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -passes=indvars -S | FileCheck %s
+
+declare void @foo(i16 noundef)
+
+; Function Attrs: mustprogress noreturn uwtable
+define void @bar(i64 noundef %ptr) {
+; CHECK-LABEL: @bar(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP0:%.*]] = trunc i64 [[PTR:%.*]] to i4
+; CHECK-NEXT: [[TMP1:%.*]] = zext i4 [[TMP0]] to i16
+; CHECK-NEXT: br label [[WHILE_BODY:%.*]]
+; CHECK: while.body:
+; CHECK-NEXT: tail call void @foo(i16 noundef signext [[TMP1]])
+; CHECK-NEXT: br label [[WHILE_BODY]]
+;
+entry:
+ br label %while.body
+
+while.body: ; preds = %entry, %while.body
+ %0 = phi i64 [ %ptr, %entry ], [ %add.ptr, %while.body ]
+ %1 = trunc i64 %0 to i16
+ %and = and i16 %1, 15 ; loop invariant
+ tail call void @foo(i16 noundef signext %and)
+ %add.ptr = add nsw i64 %0, 16
+ br label %while.body
+}
+
>From 6586977812ed9e5f9f99fecf2d0881e788fe06ea Mon Sep 17 00:00:00 2001
From: Marcos Horro <marc...@amd.com>
Date: Tue, 7 Nov 2023 17:20:48 +0000
Subject: [PATCH 2/2] Fixing test on X86
---
llvm/test/Transforms/IndVarSimplify/X86/eliminate-trunc.ll | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/llvm/test/Transforms/IndVarSimplify/X86/eliminate-trunc.ll
b/llvm/test/Transforms/IndVarSimplify/X86/eliminate-trunc.ll
index e0c31fdbaa4fb62..e16f429b757987b 100644
--- a/llvm/test/Transforms/IndVarSimplify/X86/eliminate-trunc.ll
+++ b/llvm/test/Transforms/IndVarSimplify/X86/eliminate-trunc.ll
@@ -503,8 +503,7 @@ define void @test_11() {
; CHECK: bb4:
; CHECK-NEXT: br label [[BB6]]
; CHECK: bb5:
-; CHECK-NEXT: [[_TMP24:%.*]] = icmp slt i16 poison, 0
-; CHECK-NEXT: br i1 [[_TMP24]], label [[BB5:%.*]], label [[BB5]]
+; CHECK-NEXT: br i1 poison, label [[BB5:%.*]], label [[BB5]]
; CHECK: bb6:
; CHECK-NEXT: br i1 false, label [[BB1]], label [[BB7:%.*]]
; CHECK: bb7:
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