[x86] Fix the RUN-lines of this test to make sense.

[oota-llvm.git] / test / Analysis / BasicAA / nocapture.ll

diff --git a/test/Analysis/BasicAA/nocapture.ll b/test/Analysis/BasicAA/nocapture.ll
index aa4c7f194cd1bcf7cb3bee5c82afca4ffc16224a..ffc0a09a078dc11c82afd7f45d1c698847c8cea6 100644 (file)
--- a/test/Analysis/BasicAA/nocapture.ll
+++ b/test/Analysis/BasicAA/nocapture.ll
@@ -1,13 +1,36 @@
-; RUN: llvm-as < %s | opt -basicaa -gvn -instcombine | llvm-dis | grep {ret i32 0}
+; RUN: opt < %s -basicaa -gvn -instcombine -S | FileCheck %s
 
 declare i32* @test(i32* nocapture)
 
 define i32 @test2() {
-       %P = alloca i32
-       %Q = call i32* @test(i32* %P)
-       %a = load i32* %P
-       store i32 4, i32* %Q   ;; cannot clobber P since it is nocapture.
-       %b = load i32* %P
-       %c = sub i32 %a, %b
-       ret i32 %c
+; CHECK: ret i32 0
+       %P = alloca i32
+       %Q = call i32* @test(i32* %P)
+       %a = load i32* %P
+       store i32 4, i32* %Q   ;; cannot clobber P since it is nocapture.
+       %b = load i32* %P
+       %c = sub i32 %a, %b
+       ret i32 %c
+}
+
+declare void @test3(i32** %p, i32* %q) nounwind
+
+define i32 @test4(i32* noalias nocapture %p) nounwind {
+; CHECK: call void @test3
+; CHECK: store i32 0, i32* %p
+; CHECK: store i32 1, i32* %x
+; CHECK: %y = load i32* %p
+; CHECK: ret i32 %y
+entry:
+       %q = alloca i32*
+       ; Here test3 might store %p to %q. This doesn't violate %p's nocapture
+       ; attribute since the copy doesn't outlive the function.
+       call void @test3(i32** %q, i32* %p) nounwind
+       store i32 0, i32* %p
+       %x = load i32** %q
+       ; This store might write to %p and so we can't eliminate the subsequent
+       ; load
+       store i32 1, i32* %x
+       %y = load i32* %p
+       ret i32 %y
 }