From 2454a2e0c3372a92439fc08bb651b995e3beb3eb Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 29 Jan 2008 06:52:45 +0000
Subject: eliminate additions of 0.0 when they are obviously dead.  This has to
 be careful to avoid turning -0.0 + 0.0 -> -0.0 which is incorrect.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46499 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/InstCombine/zero-point-zero-add.ll | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 test/Transforms/InstCombine/zero-point-zero-add.ll

(limited to 'test/Transforms')

diff --git a/test/Transforms/InstCombine/zero-point-zero-add.ll b/test/Transforms/InstCombine/zero-point-zero-add.ll
new file mode 100644
index 0000000..bae60d9
--- /dev/null
+++ b/test/Transforms/InstCombine/zero-point-zero-add.ll
@@ -0,0 +1,15 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep 0.0 | count 1
+
+declare double @abs(double)
+
+define double @test(double %X) {
+  %Y = add double %X, 0.0          ;; Should be a single add x, 0.0
+  %Z = add double %Y, 0.0
+  ret double %Z
+}
+
+define double @test1(double %X) {
+  %Y = call double @abs(double %X)
+  %Z = add double %Y, 0.0
+  ret double %Z
+}
-- 
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