Invert isSafeToGetMallocArraySize check because we return NULL when we don't know the size.

Thanks to Duncan Sands for noticing this bug.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84260 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 30 insertions, 0 deletions

diff --git a/test/Transforms/GlobalOpt/2009-11-16-MallocSingleStoreToGlobalVar.ll b/test/Transforms/GlobalOpt/2009-11-16-MallocSingleStoreToGlobalVar.ll
new file mode 100644
index 0000000..c43565a
--- /dev/null
+++ b/test/Transforms/GlobalOpt/2009-11-16-MallocSingleStoreToGlobalVar.ll
@@ -0,0 +1,30 @@
+; Test ensures that non-optimizable array mallocs are not optimized; specifically
+; GlobalOpt was treating a non-optimizable array malloc as a non-array malloc
+; and optimizing the global object that the malloc was stored to as a single
+; element global.  The global object @TOP in this test should not be optimized.
+; RUN: opt < %s -globalopt -S | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
+target triple = "x86_64-apple-darwin10.0"
+
+@TOP = internal global i64* null                    ; <i64**> [#uses=2]
+; CHECK: @TOP = internal global i64* null
+@channelColumns = internal global i64 0             ; <i64*> [#uses=2]
+
+; Derived from @DescribeChannel() in yacr2
+define void @test() nounwind ssp {
+  store i64 2335, i64* @channelColumns, align 8
+  %1 = load i64* @channelColumns, align 8         ; <i64> [#uses=1]
+  %2 = shl i64 %1, 3                              ; <i64> [#uses=1]
+  %3 = add i64 %2, 8                              ; <i64> [#uses=1]
+  %4 = call noalias i8* @malloc(i64 %3) nounwind  ; <i8*> [#uses=1]
+; CHECK: call noalias i8* @malloc
+  %5 = bitcast i8* %4 to i64*                     ; <i64*> [#uses=1]
+  store i64* %5, i64** @TOP, align 8
+  %6 = load i64** @TOP, align 8                   ; <i64*> [#uses=1]
+  %7 = getelementptr inbounds i64* %6, i64 13     ; <i64*> [#uses=1]
+  store i64 0, i64* %7, align 8
+  ret void
+}
+
+declare noalias i8* @malloc(i64) nounwind