[InstCombine] Don't miscompile select to poison

[oota-llvm.git] / test / Transforms / InstCombine / shift-sra.ll

diff --git a/test/Transforms/InstCombine/shift-sra.ll b/test/Transforms/InstCombine/shift-sra.ll
index a14dce8250e4fe931e24531a535be24984507702..75235500d5136891e5e82f82903dc0adc9b84c9e 100644 (file)
--- a/test/Transforms/InstCombine/shift-sra.ll
+++ b/test/Transforms/InstCombine/shift-sra.ll
@@ -1,8 +1,78 @@
-; RUN: llvm-as < %s | opt -instcombine -disable-output &&
-; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep 'shr int'
+; RUN: opt < %s -instcombine -S | FileCheck %s
 
-int %test0(int %X, ubyte %A) {
-       %Y = shr int %X, ubyte %A  ; can be logical shift.
-       %Z = and int %Y, 1
-       ret int %Z
+
+define i32 @test1(i32 %X, i8 %A) {
+        %shift.upgrd.1 = zext i8 %A to i32              ; <i32> [#uses=1]
+        ; can be logical shift.
+        %Y = ashr i32 %X, %shift.upgrd.1                ; <i32> [#uses=1]
+        %Z = and i32 %Y, 1              ; <i32> [#uses=1]
+        ret i32 %Z
+; CHECK-LABEL: @test1(
+; CHECK: lshr i32 %X, %shift.upgrd.1 
+}
+
+define i32 @test2(i8 %tmp) {
+        %tmp3 = zext i8 %tmp to i32             ; <i32> [#uses=1]
+        %tmp4 = add i32 %tmp3, 7                ; <i32> [#uses=1]
+        %tmp5 = ashr i32 %tmp4, 3               ; <i32> [#uses=1]
+        ret i32 %tmp5
+; CHECK-LABEL: @test2(
+; CHECK: lshr i32 %tmp4, 3
+}
+
+define i64 @test3(i1 %X, i64 %Y, i1 %Cond) {
+  br i1 %Cond, label %T, label %F
+T:
+  %X2 = sext i1 %X to i64
+  br label %C
+F:
+  %Y2 = ashr i64 %Y, 63
+  br label %C
+C:
+  %P = phi i64 [%X2, %T], [%Y2, %F] 
+  %S = ashr i64 %P, 12
+  ret i64 %S
+  
+; CHECK-LABEL: @test3(
+; CHECK: %P = phi i64
+; CHECK-NEXT: ret i64 %P
+}
+
+define i64 @test4(i1 %X, i64 %Y, i1 %Cond) {
+  br i1 %Cond, label %T, label %F
+T:
+  %X2 = sext i1 %X to i64
+  br label %C
+F:
+  %Y2 = ashr i64 %Y, 63
+  br label %C
+C:
+  %P = phi i64 [%X2, %T], [%Y2, %F] 
+  %R = shl i64 %P, 12
+  %S = ashr i64 %R, 12
+  ret i64 %S
+  
+; CHECK-LABEL: @test4(
+; CHECK: %P = phi i64
+; CHECK-NEXT: ret i64 %P
+}
+
+; rdar://7732987
+define i32 @test5(i32 %Y) {
+  br i1 undef, label %A, label %C
+A:
+  br i1 undef, label %B, label %D
+B:
+  br label %D
+C:
+  br i1 undef, label %D, label %E
+D:
+  %P = phi i32 [0, %A], [0, %B], [%Y, %C] 
+  %S = ashr i32 %P, 16
+  ret i32 %S
+; CHECK-LABEL: @test5(
+; CHECK: %P = phi i32
+; CHECK-NEXT: ashr i32 %P, 16
+E:
+  ret i32 0
 }