[ARM] Pass a callback to FunctionPass constructors to enable skipping execution

on a per-function basis.

Previously some of the passes were conditionally added to ARM's pass pipeline
based on the target machine's subtarget. This patch makes changes to add those
passes unconditionally and execute them conditonally based on the predicate
functor passed to the pass constructors. This enables running different sets of
passes for different functions in the module.

rdar://problem/20542263

Differential Revision: http://reviews.llvm.org/D8717

llvm-svn: 239325

1 files changed, 22 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/ifcvt-callback.ll b/llvm/test/CodeGen/ARM/ifcvt-callback.ll
new file mode 100644
index 00000000000..62a66e745b3
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/ifcvt-callback.ll
@@ -0,0 +1,22 @@
+; RUN: llc -march thumb %s -o - | FileCheck %s
+
+; This test checks that if-conversion pass is unconditionally added to the pass
+; pipeline and is conditionally executed based on the per-function targert-cpu
+; attribute.
+ 
+; CHECK: ite eq
+
+define i32 @test_ifcvt(i32 %a, i32 %b) #0 {
+  %tmp2 = icmp eq i32 %a, 0
+  br i1 %tmp2, label %cond_false, label %cond_true
+
+cond_true:
+  %tmp5 = add i32 %b, 1
+  ret i32 %tmp5
+
+cond_false:
+  %tmp7 = add i32 %b, -1
+  ret i32 %tmp7
+}
+
+attributes #0 = { "target-cpu"="cortex-a8" }