Handle the situation where CodeGenPrepare removes a reference to a BB that has

[oota-llvm.git] / test / CodeGen / ARM / sub-cmp-peephole.ll

diff --git a/test/CodeGen/ARM/sub-cmp-peephole.ll b/test/CodeGen/ARM/sub-cmp-peephole.ll
index b3a9dc512481cddf7592d848b7de7cca203b3a0c..2961b94d2c1e6a6178c74a69c54921a878b5ac89 100644 (file)
--- a/test/CodeGen/ARM/sub-cmp-peephole.ll
+++ b/test/CodeGen/ARM/sub-cmp-peephole.ll
@@ -1,8 +1,8 @@
-; RUN: llc < %s -march=arm | FileCheck %s
+; RUN: llc < %s -mtriple=arm-apple-darwin | FileCheck %s
 
 define i32 @f(i32 %a, i32 %b) nounwind ssp {
 entry:
-; CHECK: _f:
+; CHECK: f:
 ; CHECK: subs
 ; CHECK-NOT: cmp
   %cmp = icmp sgt i32 %a, %b
@@ -13,7 +13,7 @@ entry:
 
 define i32 @g(i32 %a, i32 %b) nounwind ssp {
 entry:
-; CHECK: _g:
+; CHECK: g:
 ; CHECK: subs
 ; CHECK-NOT: cmp
   %cmp = icmp slt i32 %a, %b
@@ -24,7 +24,7 @@ entry:
 
 define i32 @h(i32 %a, i32 %b) nounwind ssp {
 entry:
-; CHECK: _h:
+; CHECK: h:
 ; CHECK: subs
 ; CHECK-NOT: cmp
   %cmp = icmp sgt i32 %a, 3
@@ -32,3 +32,55 @@ entry:
   %sub. = select i1 %cmp, i32 %sub, i32 %b
   ret i32 %sub.
 }
+
+; rdar://11725965
+define i32 @i(i32 %a, i32 %b) nounwind readnone ssp {
+entry:
+; CHECK: i:
+; CHECK: subs
+; CHECK-NOT: cmp
+  %cmp = icmp ult i32 %a, %b
+  %sub = sub i32 %b, %a
+  %sub. = select i1 %cmp, i32 %sub, i32 0
+  ret i32 %sub.
+}
+; If CPSR is live-out, we can't remove cmp if there exists
+; a swapped sub.
+define i32 @j(i32 %a, i32 %b) nounwind {
+entry:
+; CHECK: j:
+; CHECK: sub
+; CHECK: cmp
+  %cmp = icmp eq i32 %b, %a
+  %sub = sub nsw i32 %a, %b
+  br i1 %cmp, label %if.then, label %if.else
+
+if.then:
+  %cmp2 = icmp sgt i32 %b, %a
+  %sel = select i1 %cmp2, i32 %sub, i32 %a
+  ret i32 %sel
+
+if.else:
+  ret i32 %sub
+}
+
+; If the sub/rsb instruction is predicated, we can't use the flags.
+; <rdar://problem/12263428>
+; Test case from MultiSource/Benchmarks/Ptrdist/bc/number.s
+; CHECK: bc_raise
+; CHECK: rsbeq
+; CHECK: cmp
+define i32 @bc_raise() nounwind ssp {
+entry:
+  %val.2.i = select i1 undef, i32 0, i32 undef
+  %sub.i = sub nsw i32 0, %val.2.i
+  %retval.0.i = select i1 undef, i32 %val.2.i, i32 %sub.i
+  %cmp1 = icmp eq i32 %retval.0.i, 0
+  br i1 %cmp1, label %land.lhs.true, label %if.end11
+
+land.lhs.true:                                    ; preds = %num2long.exit
+  ret i32 17
+
+if.end11:                                         ; preds = %num2long.exit
+  ret i32 23
+}