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-rw-r--r--test/Transforms/InstCombine/CPP_min_max.llx34
1 files changed, 34 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/CPP_min_max.llx b/test/Transforms/InstCombine/CPP_min_max.llx
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--- /dev/null
+++ b/test/Transforms/InstCombine/CPP_min_max.llx
@@ -0,0 +1,34 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep select | not grep 'int\*'
+
+; This testcase corresponds to PR362, which notices that this horrible code
+; is generated by the C++ front-end and LLVM optimizers, which has lots of
+; loads and other stuff that are unneeded.
+;
+; Instcombine should propagate the load through the select instructions to
+; allow elimination of the extra stuff by the mem2reg pass.
+
+implementation ; Functions:
+
+void %_Z5test1RiS_(int* %x, int* %y) {
+entry:
+ %tmp.1.i = load int* %y ; <int> [#uses=1]
+ %tmp.3.i = load int* %x ; <int> [#uses=1]
+ %tmp.4.i = setlt int %tmp.1.i, %tmp.3.i ; <bool> [#uses=1]
+ %retval.i = select bool %tmp.4.i, int* %y, int* %x ; <int*> [#uses=1]
+ %tmp.4 = load int* %retval.i ; <int> [#uses=1]
+ store int %tmp.4, int* %x
+ ret void
+}
+
+void %_Z5test2RiS_(int* %x, int* %y) {
+entry:
+ %tmp.0 = alloca int ; <int*> [#uses=2]
+ %tmp.2 = load int* %x ; <int> [#uses=2]
+ store int %tmp.2, int* %tmp.0
+ %tmp.3.i = load int* %y ; <int> [#uses=1]
+ %tmp.4.i = setlt int %tmp.2, %tmp.3.i ; <bool> [#uses=1]
+ %retval.i = select bool %tmp.4.i, int* %y, int* %tmp.0 ; <int*> [#uses=1]
+ %tmp.6 = load int* %retval.i ; <int> [#uses=1]
+ store int %tmp.6, int* %y
+ ret void
+}