[SimplifyLibCalls] Library call simplification doen't work if the call site

isn't using the default calling convention.  However, if the transformation is
from a call to inline IR, then the calling convention doesn't matter.
rdar://13157990

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174724 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 48 insertions, 0 deletions

diff --git a/test/Transforms/InstSimplify/call-callconv.ll b/test/Transforms/InstSimplify/call-callconv.ll
new file mode 100644
index 0000000000..e475be781d
--- /dev/null
+++ b/test/Transforms/InstSimplify/call-callconv.ll
@@ -0,0 +1,48 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+; Verify that the non-default calling conv doesn't prevent the libcall simplification
+
+@.str = private unnamed_addr constant [4 x i8] c"abc\00", align 1
+
+define arm_aapcscc i32 @_abs(i32 %i) nounwind readnone {
+; CHECK: _abs
+  %call = tail call arm_aapcscc i32 @abs(i32 %i) nounwind readnone
+  ret i32 %call
+; CHECK: %[[ISPOS:.*]] = icmp sgt i32 %i, -1
+; CHECK: %[[NEG:.*]] = sub i32 0, %i
+; CHECK: %[[RET:.*]] = select i1 %[[ISPOS]], i32 %i, i32 %[[NEG]]
+; CHECK: ret i32 %[[RET]]
+}
+
+declare arm_aapcscc i32 @abs(i32) nounwind readnone
+
+define arm_aapcscc i32 @_labs(i32 %i) nounwind readnone {
+; CHECK: _labs
+  %call = tail call arm_aapcscc i32 @labs(i32 %i) nounwind readnone
+  ret i32 %call
+; CHECK: %[[ISPOS:.*]] = icmp sgt i32 %i, -1
+; CHECK: %[[NEG:.*]] = sub i32 0, %i
+; CHECK: %[[RET:.*]] = select i1 %[[ISPOS]], i32 %i, i32 %[[NEG]]
+; CHECK: ret i32 %[[RET]]
+}
+
+declare arm_aapcscc i32 @labs(i32) nounwind readnone
+
+define arm_aapcscc i32 @_strlen1() {
+; CHECK: _strlen1
+  %call = tail call arm_aapcscc i32 @strlen(i8* getelementptr inbounds ([4 x i8]* @.str, i32 0, i32 0))
+  ret i32 %call
+; CHECK: ret i32 3
+}
+
+declare arm_aapcscc i32 @strlen(i8*)
+
+define arm_aapcscc zeroext i1 @_strlen2(i8* %str) {
+; CHECK: _strlen2
+  %call = tail call arm_aapcscc i32 @strlen(i8* %str)
+  %cmp = icmp ne i32 %call, 0
+  ret i1 %cmp
+
+; CHECK: %[[STRLENFIRST:.*]] = load i8* %str
+; CHECK: %[[CMP:.*]] = icmp ne i8 %[[STRLENFIRST]], 0
+; CHECK: ret i1 %[[CMP]]
+}