From 36872b5db9f5a2a808ddd71df24017b7a9c0064c Mon Sep 17 00:00:00 2001
From: Johannes Doerfert <doerfert@cs.uni-saarland.de>
Date: Sat, 19 Jan 2019 05:19:12 +0000
Subject: Enable IPConstantPropagation to work with abstract call sites

This modification of the currently unused inter-procedural constant
propagation pass (IPConstantPropagation) shows how abstract call sites
enable optimization of callback calls alongside direct and indirect
calls. Through minimal changes, mostly dealing with the partial mapping
of callbacks, inter-procedural constant propagation was enabled for
callbacks, e.g., OpenMP runtime calls or pthreads_create.

Differential Revision: https://reviews.llvm.org/D56447

llvm-svn: 351628
---
 .../IPConstantProp/multiple_callbacks.ll           | 87 ++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 llvm/test/Transforms/IPConstantProp/multiple_callbacks.ll

(limited to 'llvm/test/Transforms/IPConstantProp/multiple_callbacks.ll')

diff --git a/llvm/test/Transforms/IPConstantProp/multiple_callbacks.ll b/llvm/test/Transforms/IPConstantProp/multiple_callbacks.ll
new file mode 100644
index 00000000000..3288b5b94de
--- /dev/null
+++ b/llvm/test/Transforms/IPConstantProp/multiple_callbacks.ll
@@ -0,0 +1,87 @@
+; RUN: opt -ipconstprop -S < %s | FileCheck %s
+;
+;
+;                            /---------------------------------------|
+;                            |                /----------------------|----|
+;                            |                |                /-----|    |
+;                            V                V                V     |    |
+;    void broker(int (*cb0)(int), int (*cb1)(int), int (*cb2)(int), int, int);
+;
+;    static int cb0(int zero) {
+;      return zero;
+;    }
+;    static int cb1(int unknown) {
+;      return unknown;
+;    }
+;    static int cb2(int unknown) {
+;      cb0(0);
+;      return unknown;
+;    }
+;    static int cb3(int unknown) {
+;      return unknown;
+;    }
+;    static int cb4(int unknown) {
+;      return unknown;
+;    }
+;
+;    void foo() {
+;      cb0(0);
+;      cb3(1);
+;      broker(cb0, cb1, cb0, 0, 1);
+;      broker(cb1, cb2, cb2, 0, 1);
+;      broker(cb3, cb2, cb3, 0, 1);
+;      broker(cb4, cb4, cb4, 0, 1);
+;    }
+;
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define internal i32 @cb0(i32 %zero) {
+entry:
+; CHECK:      @cb0
+; CHECK-NEXT: entry
+; CHECK-NEXT: ret i32 0
+  ret i32 %zero
+}
+
+define internal i32 @cb1(i32 %unknown) {
+entry:
+; CHECK: ret i32 %unknown
+  ret i32 %unknown
+}
+
+define internal i32 @cb2(i32 %unknown) {
+entry:
+  %call = call i32 @cb0(i32 0)
+; CHECK: ret i32 %unknown
+  ret i32 %unknown
+}
+
+define internal i32 @cb3(i32 %unknown) {
+entry:
+; CHECK: ret i32 %unknown
+  ret i32 %unknown
+}
+
+define internal i32 @cb4(i32 %unknown) {
+entry:
+; CHECK: ret i32 %unknown
+  ret i32 %unknown
+}
+
+define void @foo() {
+entry:
+  %call = call i32 @cb0(i32 0)
+  %call1 = call i32 @cb3(i32 1)
+  call void @broker(i32 (i32)* nonnull @cb0, i32 (i32)* nonnull @cb1, i32 (i32)* nonnull @cb0, i32 0, i32 1)
+  call void @broker(i32 (i32)* nonnull @cb1, i32 (i32)* nonnull @cb2, i32 (i32)* nonnull @cb2, i32 0, i32 1)
+  call void @broker(i32 (i32)* nonnull @cb3, i32 (i32)* nonnull @cb2, i32 (i32)* nonnull @cb3, i32 0, i32 1)
+  call void @broker(i32 (i32)* nonnull @cb4, i32 (i32)* nonnull @cb4, i32 (i32)* nonnull @cb4, i32 0, i32 1)
+  ret void
+}
+
+declare !callback !3 void @broker(i32 (i32)*, i32 (i32)*, i32 (i32)*, i32, i32)
+
+!0 = !{i64 0, i64 3, i1 false}
+!1 = !{i64 1, i64 4, i1 false}
+!2 = !{i64 2, i64 3, i1 false}
+!3 = !{!0, !2, !1}
-- 
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