diff options
Diffstat (limited to 'test/Analysis/BlockFrequencyInfo/bad_input.ll')
-rw-r--r-- | test/Analysis/BlockFrequencyInfo/bad_input.ll | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/test/Analysis/BlockFrequencyInfo/bad_input.ll b/test/Analysis/BlockFrequencyInfo/bad_input.ll new file mode 100644 index 0000000000..bcdc1e6f0b --- /dev/null +++ b/test/Analysis/BlockFrequencyInfo/bad_input.ll @@ -0,0 +1,50 @@ +; RUN: opt < %s -analyze -block-freq | FileCheck %s + +declare void @g(i32 %x) + +; CHECK-LABEL: Printing analysis {{.*}} for function 'branch_weight_0': +; CHECK-NEXT: block-frequency-info: branch_weight_0 +define void @branch_weight_0(i32 %a) { +; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]] +entry: + br label %for.body + +; Check that we get 1,4 instead of 0,3. +; CHECK-NEXT: for.body: float = 4.0, +for.body: + %i = phi i32 [ 0, %entry ], [ %inc, %for.body ] + call void @g(i32 %i) + %inc = add i32 %i, 1 + %cmp = icmp ugt i32 %inc, %a + br i1 %cmp, label %for.end, label %for.body, !prof !0 + +; CHECK-NEXT: for.end: float = 1.0, int = [[ENTRY]] +for.end: + ret void +} + +!0 = metadata !{metadata !"branch_weights", i32 0, i32 3} + +; CHECK-LABEL: Printing analysis {{.*}} for function 'infinite_loop' +; CHECK-NEXT: block-frequency-info: infinite_loop +define void @infinite_loop(i1 %x) { +; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]] +entry: + br i1 %x, label %for.body, label %for.end, !prof !1 + +; Check that the loop scale maxes out at 4096, giving 2048 here. +; CHECK-NEXT: for.body: float = 2048.0, +for.body: + %i = phi i32 [ 0, %entry ], [ %inc, %for.body ] + call void @g(i32 %i) + %inc = add i32 %i, 1 + br label %for.body + +; Check that the exit weight is half of entry, since half is lost in the +; infinite loop above. +; CHECK-NEXT: for.end: float = 0.5, +for.end: + ret void +} + +!1 = metadata !{metadata !"branch_weights", i32 1, i32 1} |