+; RUN: llc -O0 -debug %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=LLC-O0
+; RUN: llc -O1 -debug %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=LLC-Ox
+; RUN: llc -O2 -debug %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=LLC-Ox
+; RUN: llc -O3 -debug %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=LLC-Ox
+; RUN: llc -misched-postra -debug %s -o /dev/null 2>&1 | FileCheck %s --check-prefix=LLC-MORE
+
+; REQUIRES: asserts
+
+; This test verifies that we don't run Machine Function optimizations
+; on optnone functions.
+
+; Function Attrs: noinline optnone
+define i32 @_Z3fooi(i32 %x) #0 {
+entry:
+ %x.addr = alloca i32, align 4
+ store i32 %x, i32* %x.addr, align 4
+ br label %while.cond
+
+while.cond: ; preds = %while.body, %entry
+ %0 = load i32* %x.addr, align 4
+ %dec = add nsw i32 %0, -1
+ store i32 %dec, i32* %x.addr, align 4
+ %tobool = icmp ne i32 %0, 0
+ br i1 %tobool, label %while.body, label %while.end
+
+while.body: ; preds = %while.cond
+ br label %while.cond
+
+while.end: ; preds = %while.cond
+ ret i32 0
+}
+
+attributes #0 = { optnone noinline }
+
+; Nothing that runs at -O0 gets skipped.
+; LLC-O0-NOT: Skipping pass
+
+; Machine Function passes run at -O1 and higher.
+; LLC-Ox-DAG: Skipping pass 'Branch Probability Basic Block Placement'
+; LLC-Ox-DAG: Skipping pass 'CodeGen Prepare'
+; LLC-Ox-DAG: Skipping pass 'Control Flow Optimizer'
+; LLC-Ox-DAG: Skipping pass 'Machine code sinking'
+; LLC-Ox-DAG: Skipping pass 'Machine Common Subexpression Elimination'
+; LLC-Ox-DAG: Skipping pass 'Machine Copy Propagation Pass'
+; LLC-Ox-DAG: Skipping pass 'Machine Loop Invariant Code Motion'
+; LLC-Ox-DAG: Skipping pass 'Merge disjoint stack slots'
+; LLC-Ox-DAG: Skipping pass 'Optimize machine instruction PHIs'
+; LLC-Ox-DAG: Skipping pass 'Peephole Optimizations'
+; LLC-Ox-DAG: Skipping pass 'Post RA top-down list latency scheduler'
+; LLC-Ox-DAG: Skipping pass 'Remove dead machine instructions'
+; LLC-Ox-DAG: Skipping pass 'Tail Duplication'
+
+; Alternate post-RA scheduler.
+; LLC-MORE: Skipping pass 'PostRA Machine Instruction Scheduler'