Fix the inliner so that the optsize function attribute don't alter the

inline threshold if the global inline threshold is lower (as for -Oz).

Reviewed by Chandler Carruth and Bill Wendling.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157323 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 33 insertions, 0 deletions

diff --git a/test/Transforms/Inline/inline-optsize.ll b/test/Transforms/Inline/inline-optsize.ll
new file mode 100644
index 0000000000..20d7426abd
--- /dev/null
+++ b/test/Transforms/Inline/inline-optsize.ll
@@ -0,0 +1,33 @@
+; RUN: opt -S -Oz %s | FileCheck %s -check-prefix=OZ
+; RUN: opt -S -O2 %s | FileCheck %s -check-prefix=O2
+
+; The inline threshold for a function with the optsize attribute is currently
+; the same as the global inline threshold for -Os. Check that the optsize
+; function attribute don't alter the function specific inline threshold if the
+; global inline threshold is lower (as for -Oz).
+
+@a = global i32 4
+
+; This function should be larger than the inline threshold for -Oz (25), but
+; smaller than the inline threshold for optsize (75).
+define i32 @inner() {
+  %a1 = load volatile i32* @a
+  %x1 = add i32 %a1,  %a1
+  %a2 = load volatile i32* @a
+  %x2 = add i32 %x1, %a2
+  %a3 = load volatile i32* @a
+  %x3 = add i32 %x2, %a3
+  %a4 = load volatile i32* @a
+  %x4 = add i32 %x3, %a4
+  %a5 = load volatile i32* @a
+  %x5 = add i32 %x3, %a5
+  ret i32 %x5
+}
+
+; @inner() should be inlined for -O2 but not for -Oz.
+; OZ: call
+; O2-NOT: call
+define i32 @outer() optsize {
+   %r = call i32 @inner()
+   ret i32 %r
+}