From c7b3444095f9aa5398d134c780e327a187cda231 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Mon, 27 Apr 2009 02:00:55 +0000
Subject: When transforming sext(trunc(load(x))) into sext(smaller load(x)),
 the trunc is directly replaced with the smaller load, so don't try to create
 a new sext node. This fixes PR4050.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70179 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/CodeGen/X86/fold-sext-trunc.ll | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 test/CodeGen/X86/fold-sext-trunc.ll

(limited to 'test/CodeGen/X86/fold-sext-trunc.ll')

diff --git a/test/CodeGen/X86/fold-sext-trunc.ll b/test/CodeGen/X86/fold-sext-trunc.ll
new file mode 100644
index 0000000..1016b10
--- /dev/null
+++ b/test/CodeGen/X86/fold-sext-trunc.ll
@@ -0,0 +1,20 @@
+; RUN: llvm-as < %s | llc -march=x86-64 | grep movslq | count 1
+; PR4050
+
+	type { i64 }		; type %0
+	%struct.S1 = type { i16, i32 }
+@g_10 = external global %struct.S1		; <%struct.S1*> [#uses=2]
+
+declare void @func_28(i64, i64)
+
+define void @int322(i32 %foo) nounwind {
+entry:
+	%val = load i64* getelementptr (%0* bitcast (%struct.S1* @g_10 to %0*), i32 0, i32 0)		; <i64> [#uses=1]
+	%0 = load i32* getelementptr (%struct.S1* @g_10, i32 0, i32 1), align 4		; <i32> [#uses=1]
+	%1 = sext i32 %0 to i64		; <i64> [#uses=1]
+	%tmp4.i = lshr i64 %val, 32		; <i64> [#uses=1]
+	%tmp5.i = trunc i64 %tmp4.i to i32		; <i32> [#uses=1]
+	%2 = sext i32 %tmp5.i to i64		; <i64> [#uses=1]
+	tail call void @func_28(i64 %2, i64 %1) nounwind
+	ret void
+}
-- 
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