[IPSCCP] Restore the old behaviour (pre r293799).

It's not clear the change I made a good idea, and it definitely needs
further discussion. Thanks to Eli for pointing out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293846 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp
index 054ad712d3849e985c8512fa9ad492a5d8dc7afa..dd1123fd4faf1c1a95403a4185455db2bdfc4c27 100644 (file)
--- a/lib/Transforms/Scalar/SCCP.cpp
+++ b/lib/Transforms/Scalar/SCCP.cpp
@@ -1715,12 +1715,7 @@ static bool runIPSCCP(Module &M, const DataLayout &DL,
     // Don't touch naked functions. They may contain asm returning a
     // value we don't see, so we may end up interprocedurally propagating
     // the return value incorrectly.
-    // Also, don't touch functions marked as noinline. Trivial functions may
-    // essentially be inlined because of return value propagation.
-    // (e.g. int tinkywinky(void) { return 666; })
-    if (F.hasExactDefinition() &&
-        !(F.hasFnAttribute(Attribute::Naked) ||
-          F.hasFnAttribute(Attribute::NoInline)))
+    if (F.hasExactDefinition() && !F.hasFnAttribute(Attribute::Naked))
       Solver.AddTrackedFunction(&F);
 
     // If this function only has direct calls that we can see, we can track its

diff --git a/test/Transforms/IPConstantProp/noinline-return.ll b/test/Transforms/IPConstantProp/noinline-return.ll
deleted file mode 100644 (file)
index 1095032..0000000
--- a/test/Transforms/IPConstantProp/noinline-return.ll
+++ /dev/null
@@ -1,21 +0,0 @@
-; RUN: opt %s -ipsccp -S | FileCheck %s
-
-define i32 @tinkywinky() #0 {
-entry:
-  ret i32 5
-}
-
-define i32 @patatino() {
-entry:
-  %call = call i32 @tinkywinky()
-
-; Check that we don't propagate the return value of
-; @tinkywinky.
-; CHECK: call i32 @dipsy(i32 %call)
-  %call1 = call i32 @dipsy(i32 %call)
-  ret i32 %call1
-}
-
-declare i32 @dipsy(i32)
-
-attributes #0 = { noinline }