InstCombine: correctly change byval type attribute alongside call args.

When the byval attribute has a type, it must match the pointee type of
any parameter; but InstCombine was not updating the attribute when
folding casts of various kinds away.

llvm-svn: 362643

1 files changed, 24 insertions, 0 deletions

diff --git a/llvm/test/Transforms/InstCombine/byval.ll b/llvm/test/Transforms/InstCombine/byval.ll
new file mode 100644
index 00000000000..2af32b8b62c
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/byval.ll
@@ -0,0 +1,24 @@
+; RUN: opt -S -instcombine %s | FileCheck %s
+
+declare void @add_byval_callee(double*)
+
+; CHECK-LABEL: define void @add_byval
+; CHECK: [[ARG:%.*]] = bitcast i64* %in to double*
+; CHECK: call void @add_byval_callee(double* byval(double) [[ARG]])
+define void @add_byval(i64* %in) {
+  %tmp = bitcast void (double*)* @add_byval_callee to void (i64*)*
+  call void %tmp(i64* byval(i64) %in)
+  ret void
+}
+
+%t2 = type { i8 }
+
+; CHECK-LABEL: define void @vararg_byval
+; CHECK: call void (i8, ...) @vararg_callee(i8 undef, i8* byval(i8) %p)
+define void @vararg_byval(i8* %p) {
+  %tmp = bitcast i8* %p to %t2*
+  call void (i8, ...) @vararg_callee(i8 undef, %t2* byval(%t2) %tmp)
+  ret void
+}
+
+declare void @vararg_callee(i8, ...)