1 files changed, 51 insertions, 0 deletions
diff --git a/test/CodeGen/X86/lsr-delayed-fold.ll b/test/CodeGen/X86/lsr-delayed-fold.ll
new file mode 100644
index 000000000000..17d6a4c0915f
--- /dev/null
+++ b/test/CodeGen/X86/lsr-delayed-fold.ll
@@ -0,0 +1,51 @@
+; RUN: llc -march=x86-64 < %s > /dev/null
+
+; ScalarEvolution misses an opportunity to fold ((trunc x) + (trunc -x) + y),
+; but LSR should tolerate this.
+; rdar://7886751
+
+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"
+target triple = "x86_64-apple-darwin11.0"
+
+define fastcc void @formatValue(i64 %arg5) nounwind {
+bb12:                                             ; preds = %bb11
+  %t = trunc i64 %arg5 to i32                   ; <i32> [#uses=1]
+  %t13 = sub i64 0, %arg5                       ; <i64> [#uses=1]
+  %t14 = and i64 %t13, 4294967295             ; <i64> [#uses=1]
+  br label %bb15
+
+bb15:                                             ; preds = %bb21, %bb12
+  %t16 = phi i64 [ 0, %bb12 ], [ %t23, %bb15 ] ; <i64> [#uses=2]
+  %t17 = mul i64 %t14, %t16                 ; <i64> [#uses=1]
+  %t18 = add i64 undef, %t17                  ; <i64> [#uses=1]
+  %t19 = trunc i64 %t18 to i32                ; <i32> [#uses=1]
+  %t22 = icmp eq i32 %t19, %t               ; <i1> [#uses=1]
+  %t23 = add i64 %t16, 1                      ; <i64> [#uses=1]
+  br i1 %t22, label %bb24, label %bb15
+
+bb24:                                             ; preds = %bb21, %bb11
+  unreachable
+}
+
+; ScalarEvolution should be able to correctly expand the crazy addrec here.
+; PR6914
+
+define void @int323() nounwind {
+entry:
+  br label %for.cond
+
+for.cond:                                         ; preds = %lbl_264, %for.inc, %entry
+  %g_263.tmp.1 = phi i8 [ undef, %entry ], [ %g_263.tmp.1, %for.cond ]
+  %p_95.addr.0 = phi i8 [ 0, %entry ], [ %add, %for.cond ]
+  %add = add i8 %p_95.addr.0, 1                   ; <i8> [#uses=1]
+  br i1 undef, label %for.cond, label %lbl_264
+
+lbl_264:                                          ; preds = %if.end, %lbl_264.preheader
+  %g_263.tmp.0 = phi i8 [ %g_263.tmp.1, %for.cond ] ; <i8> [#uses=1]
+  %tmp7 = load i16* undef                         ; <i16> [#uses=1]
+  %conv8 = trunc i16 %tmp7 to i8                  ; <i8> [#uses=1]
+  %mul.i = mul i8 %p_95.addr.0, %p_95.addr.0      ; <i8> [#uses=1]
+  %mul.i18 = mul i8 %mul.i, %conv8                ; <i8> [#uses=1]
+  %tobool12 = icmp eq i8 %mul.i18, 0              ; <i1> [#uses=1]
+  unreachable
+}