Provide reason messages for unviable inlining

InlineCost's isInlineViable() is changed to return InlineResult
instead of bool. This provides messages for failure reasons and
allows to get more specific messages for cases where callsites
are not viable for inlining.

Reviewed By: xbolva00, anemet

Differential Revision: https://reviews.llvm.org/D57089

llvm-svn: 352849

1 files changed, 10 insertions, 0 deletions

diff --git a/llvm/test/Transforms/Inline/inline-remark.ll b/llvm/test/Transforms/Inline/inline-remark.ll
index 402493542dc..bfb78c9ee88 100644
--- a/llvm/test/Transforms/Inline/inline-remark.ll
+++ b/llvm/test/Transforms/Inline/inline-remark.ll
@@ -46,6 +46,16 @@ define void @test2(i8*) {
   ret void
 }
 
+;; Test 3 - InlineResult messages come from llvm::isInlineViable()
+define void @test3() {
+; CHECK-LABEL: @test3
+; CHECK-NEXT: call void @test3() [[ATTR4:#[0-9]+]]
+; CHECK-NEXT: ret void
+  call void @test3() alwaysinline
+  ret void
+}
+
 ; CHECK: attributes [[ATTR1]] = { "inline-remark"="(cost=25, threshold=0)" }
 ; CHECK: attributes [[ATTR2]] = { "inline-remark"="(cost=never): recursive" }
 ; CHECK: attributes [[ATTR3]] = { "inline-remark"="unsupported operand bundle; (cost={{.*}}, threshold={{.*}})" }
+; CHECK: attributes [[ATTR4]] = { alwaysinline "inline-remark"="(cost=never): recursive call" }