From 44e5d1278bb04bec281a921b0c63a8d22e1731f6 Mon Sep 17 00:00:00 2001
From: Tom Stellard <tstellar@redhat.com>
Date: Wed, 11 Apr 2018 22:53:38 +0000
Subject: Merging r326521:

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r326521 | indutny | 2018-03-01 16:59:27 -0800 (Thu, 01 Mar 2018) | 13 lines

[ArgumentPromotion] don't break musttail invariant PR36543

Summary:
Do not break musttail invariant by promoting arguments of musttail
callee or caller.

Reviewers: sanjoy, dberlin, hfinkel, george.burgess.iv, fhahn, rnk

Reviewed By: rnk

Subscribers: rnk, llvm-commits

Differential Revision: https://reviews.llvm.org/D43926
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@329858 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/ArgumentPromotion/musttail.ll | 45 +++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 test/Transforms/ArgumentPromotion/musttail.ll

(limited to 'test')

diff --git a/test/Transforms/ArgumentPromotion/musttail.ll b/test/Transforms/ArgumentPromotion/musttail.ll
new file mode 100644
index 00000000000..aa187116869
--- /dev/null
+++ b/test/Transforms/ArgumentPromotion/musttail.ll
@@ -0,0 +1,45 @@
+; RUN: opt < %s -argpromotion -S | FileCheck %s
+; PR36543
+
+; Don't promote arguments of musttail callee
+
+%T = type { i32, i32, i32, i32 }
+
+; CHECK-LABEL: define internal i32 @test(%T* %p)
+define internal i32 @test(%T* %p) {
+  %a.gep = getelementptr %T, %T* %p, i64 0, i32 3
+  %b.gep = getelementptr %T, %T* %p, i64 0, i32 2
+  %a = load i32, i32* %a.gep
+  %b = load i32, i32* %b.gep
+  %v = add i32 %a, %b
+  ret i32 %v
+}
+
+; CHECK-LABEL: define i32 @caller(%T* %p)
+define i32 @caller(%T* %p) {
+  %v = musttail call i32 @test(%T* %p)
+  ret i32 %v
+}
+
+; Don't promote arguments of musttail caller
+
+define i32 @foo(%T* %p, i32 %v) {
+  ret i32 0
+}
+
+; CHECK-LABEL: define internal i32 @test2(%T* %p, i32 %p2)
+define internal i32 @test2(%T* %p, i32 %p2) {
+  %a.gep = getelementptr %T, %T* %p, i64 0, i32 3
+  %b.gep = getelementptr %T, %T* %p, i64 0, i32 2
+  %a = load i32, i32* %a.gep
+  %b = load i32, i32* %b.gep
+  %v = add i32 %a, %b
+  %ca = musttail call i32 @foo(%T* undef, i32 %v)
+  ret i32 %ca
+}
+
+; CHECK-LABEL: define i32 @caller2(%T* %g)
+define i32 @caller2(%T* %g) {
+  %v = call i32 @test2(%T* %g, i32 0)
+  ret i32 %v
+}
-- 
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