Make some intrinsics safe to speculatively execute.

[oota-llvm.git] / test / Transforms / SimplifyCFG / SpeculativeExec.ll

diff --git a/test/Transforms/SimplifyCFG/SpeculativeExec.ll b/test/Transforms/SimplifyCFG/SpeculativeExec.ll
index 5cfc77ce08a5b1b51ab7520e2dd1228d7ddfd101..4fbb64a4582b25b24b2b2168628f8013d3cb0579 100644 (file)
--- a/test/Transforms/SimplifyCFG/SpeculativeExec.ll
+++ b/test/Transforms/SimplifyCFG/SpeculativeExec.ll
@@ -1,7 +1,10 @@
-; RUN: opt < %s -simplifycfg  -S | grep select
-; RUN: opt < %s -simplifycfg  -S | grep br | count 2
+; RUN: opt < %s -simplifycfg -phi-node-folding-threshold=2 -S | FileCheck %s
 
-define i32 @t2(i32 %a, i32 %b, i32 %c) nounwind  {
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define i32 @test1(i32 %a, i32 %b, i32 %c) nounwind  {
+; CHECK: @test1
 entry:
         %tmp1 = icmp eq i32 %b, 0
         br i1 %tmp1, label %bb1, label %bb3
@@ -9,6 +12,11 @@ entry:
 bb1:            ; preds = %entry
        %tmp2 = icmp sgt i32 %c, 1
        br i1 %tmp2, label %bb2, label %bb3
+; CHECK: bb1:
+; CHECK-NEXT: add i32 %a, 1
+; CHECK-NEXT: icmp sgt i32 %c, 1
+; CHECK-NEXT: select i1 %tmp2, i32 %tmp3, i32 %a
+; CHECK-NEXT: br label %bb3
 
 bb2:           ; preds = bb1
        %tmp3 = add i32 %a, 1
@@ -19,3 +27,20 @@ bb3:         ; preds = %bb2, %entry
         %tmp5 = sub i32 %tmp4, 1
        ret i32 %tmp5
 }
+
+declare i8 @llvm.cttz.i8(i8, i1)
+
+define i8 @test2(i8 %a) {
+; CHECK: @test2
+  br i1 undef, label %bb_true, label %bb_false
+bb_true:
+  %b = tail call i8 @llvm.cttz.i8(i8 %a, i1 false)
+  br label %join
+bb_false:
+  br label %join
+join:
+  %c = phi i8 [%b, %bb_true], [%a, %bb_false]
+; CHECK: select
+  ret i8 %c
+}
+