[ArgPromotion] Don't drop !prof metadata on promoted calls

Noticed by inspection while doing attribute work. DAE, InstCombineCalls,
and ArgPromotion have a fair amount of duplicated code for hacking on
call sites, and you can find bugs by comparing them.

Add a test case for this.

llvm-svn: 300229

1 files changed, 23 insertions, 0 deletions

diff --git a/llvm/test/Transforms/ArgumentPromotion/profile.ll b/llvm/test/Transforms/ArgumentPromotion/profile.ll
new file mode 100644
index 00000000000..f667f9ea2c2
--- /dev/null
+++ b/llvm/test/Transforms/ArgumentPromotion/profile.ll
@@ -0,0 +1,23 @@
+; RUN: opt -argpromotion -mem2reg -S < %s | FileCheck %s
+target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
+
+; Checks if !prof metadata is corret in deadargelim.
+
+define void @caller() #0 {
+  %x = alloca i32
+  store i32 42, i32* %x
+  call void @promote_i32_ptr(i32* %x), !prof !0
+; CHECK: call void @promote_i32_ptr(i32 42), !prof ![[PROF:[0-9]]]
+  ret void
+}
+
+define internal void @promote_i32_ptr(i32* %xp) {
+  %x = load i32, i32* %xp
+  call void @use_i32(i32 %x)
+  ret void
+}
+
+declare void @use_i32(i32)
+
+; CHECK: ![[PROF]] = !{!"branch_weights", i32 30}
+!0 = !{!"branch_weights", i32 30}