; RUN: opt < %s -instcombine -S | FileCheck %s
define i32 @test1(i32 %A) {
-; CHECK: @test1
+; CHECK-LABEL: @test1(
; CHECK: ret i32 %A
%B = shl i32 %A, 0 ; <i32> [#uses=1]
ret i32 %B
}
define i32 @test2(i8 %A) {
-; CHECK: @test2
+; CHECK-LABEL: @test2(
; CHECK: ret i32 0
%shift.upgrd.1 = zext i8 %A to i32 ; <i32> [#uses=1]
%B = shl i32 0, %shift.upgrd.1 ; <i32> [#uses=1]
}
define i32 @test3(i32 %A) {
-; CHECK: @test3
+; CHECK-LABEL: @test3(
; CHECK: ret i32 %A
%B = ashr i32 %A, 0 ; <i32> [#uses=1]
ret i32 %B
}
define i32 @test4(i8 %A) {
-; CHECK: @test4
+; CHECK-LABEL: @test4(
; CHECK: ret i32 0
%shift.upgrd.2 = zext i8 %A to i32 ; <i32> [#uses=1]
%B = ashr i32 0, %shift.upgrd.2 ; <i32> [#uses=1]
define i32 @test5(i32 %A) {
-; CHECK: @test5
+; CHECK-LABEL: @test5(
; CHECK: ret i32 undef
- %B = lshr i32 %A, 32 ;; shift all bits out
+ %B = lshr i32 %A, 32 ;; shift all bits out
ret i32 %B
}
+define <4 x i32> @test5_splat_vector(<4 x i32> %A) {
+; CHECK-LABEL: @test5_splat_vector(
+; CHECK: ret <4 x i32> undef
+ %B = lshr <4 x i32> %A, <i32 32, i32 32, i32 32, i32 32> ;; shift all bits out
+ ret <4 x i32> %B
+}
+
+define <4 x i32> @test5_zero_vector(<4 x i32> %A) {
+; CHECK-LABEL: @test5_zero_vector(
+; CHECK-NEXT: ret <4 x i32> %A
+ %B = lshr <4 x i32> %A, zeroinitializer
+ ret <4 x i32> %B
+}
+
+define <4 x i32> @test5_non_splat_vector(<4 x i32> %A) {
+; CHECK-LABEL: @test5_non_splat_vector(
+; CHECK-NOT: ret <4 x i32> undef
+ %B = shl <4 x i32> %A, <i32 32, i32 1, i32 2, i32 3>
+ ret <4 x i32> %B
+}
+
define i32 @test5a(i32 %A) {
-; CHECK: @test5a
+; CHECK-LABEL: @test5a(
; CHECK: ret i32 undef
- %B = shl i32 %A, 32 ;; shift all bits out
+ %B = shl i32 %A, 32 ;; shift all bits out
ret i32 %B
}
+define <4 x i32> @test5a_splat_vector(<4 x i32> %A) {
+; CHECK-LABEL: @test5a_splat_vector(
+; CHECK: ret <4 x i32> undef
+ %B = shl <4 x i32> %A, <i32 32, i32 32, i32 32, i32 32> ;; shift all bits out
+ ret <4 x i32> %B
+}
+
+define <4 x i32> @test5a_non_splat_vector(<4 x i32> %A) {
+; CHECK-LABEL: @test5a_non_splat_vector(
+; CHECK-NOT: ret <4 x i32> undef
+ %B = shl <4 x i32> %A, <i32 32, i32 1, i32 2, i32 3>
+ ret <4 x i32> %B
+}
+
define i32 @test5b() {
-; CHECK: @test5b
+; CHECK-LABEL: @test5b(
; CHECK: ret i32 -1
%B = ashr i32 undef, 2 ;; top two bits must be equal, so not undef
ret i32 %B
}
define i32 @test5b2(i32 %A) {
-; CHECK: @test5b2
+; CHECK-LABEL: @test5b2(
; CHECK: ret i32 -1
%B = ashr i32 undef, %A ;; top %A bits must be equal, so not undef
ret i32 %B
}
define i32 @test6(i32 %A) {
-; CHECK: @test6
+; CHECK-LABEL: @test6(
; CHECK-NEXT: mul i32 %A, 6
; CHECK-NEXT: ret i32
%B = shl i32 %A, 1 ;; convert to an mul instruction
}
define i32 @test6a(i32 %A) {
-; CHECK: @test6a
+; CHECK-LABEL: @test6a(
; CHECK-NEXT: mul i32 %A, 6
; CHECK-NEXT: ret i32
%B = mul i32 %A, 3
}
define i32 @test7(i8 %A) {
-; CHECK: @test7
+; CHECK-LABEL: @test7(
; CHECK-NEXT: ret i32 -1
- %shift.upgrd.3 = zext i8 %A to i32
+ %shift.upgrd.3 = zext i8 %A to i32
%B = ashr i32 -1, %shift.upgrd.3 ;; Always equal to -1
ret i32 %B
}
;; (A << 5) << 3 === A << 8 == 0
define i8 @test8(i8 %A) {
-; CHECK: @test8
+; CHECK-LABEL: @test8(
; CHECK: ret i8 0
%B = shl i8 %A, 5 ; <i8> [#uses=1]
%C = shl i8 %B, 3 ; <i8> [#uses=1]
;; (A << 7) >> 7 === A & 1
define i8 @test9(i8 %A) {
-; CHECK: @test9
+; CHECK-LABEL: @test9(
; CHECK-NEXT: and i8 %A, 1
; CHECK-NEXT: ret i8
%B = shl i8 %A, 7 ; <i8> [#uses=1]
;; (A >> 7) << 7 === A & 128
;; The shl may be valuable to scalar evolution.
define i8 @test10(i8 %A) {
-; CHECK: @test10
+; CHECK-LABEL: @test10(
; CHECK-NEXT: and i8 %A, -128
; CHECK-NEXT: ret i8
%B = lshr i8 %A, 7 ; <i8> [#uses=1]
;; Allow the simplification when the lshr shift is exact.
define i8 @test10a(i8 %A) {
-; CHECK: @test10a
+; CHECK-LABEL: @test10a(
; CHECK-NEXT: ret i8 %A
%B = lshr exact i8 %A, 7
%C = shl i8 %B, 7
;; (A >> 3) << 4 === (A & 0x1F) << 1
;; The shl may be valuable to scalar evolution.
define i8 @test11(i8 %A) {
-; CHECK: @test11
+; CHECK-LABEL: @test11(
; CHECK: shl i8
; CHECK-NEXT: ret i8
%a = mul i8 %A, 3 ; <i8> [#uses=1]
;; Allow the simplification in InstCombine when the lshr shift is exact.
define i8 @test11a(i8 %A) {
-; CHECK: @test11a
+; CHECK-LABEL: @test11a(
; CHECK-NEXT: mul i8 %A, 6
; CHECK-NEXT: ret i8
%a = mul i8 %A, 3
;; This is deferred to DAGCombine unless %B is single-use.
;; (A >> 8) << 8 === A & -256
define i32 @test12(i32 %A) {
-; CHECK: @test12
+; CHECK-LABEL: @test12(
; CHECK-NEXT: and i32 %A, -256
; CHECK-NEXT: ret i32
%B = ashr i32 %A, 8 ; <i32> [#uses=1]
;; (A >> 3) << 4 === (A & -8) * 2
;; The shl may be valuable to scalar evolution.
define i8 @test13(i8 %A) {
-; CHECK: @test13
+; CHECK-LABEL: @test13(
; CHECK: shl i8
; CHECK-NEXT: ret i8
%a = mul i8 %A, 3 ; <i8> [#uses=1]
}
define i8 @test13a(i8 %A) {
-; CHECK: @test13a
+; CHECK-LABEL: @test13a(
; CHECK-NEXT: mul i8 %A, 6
; CHECK-NEXT: ret i8
%a = mul i8 %A, 3
;; D = ((B | 1234) << 4) === ((B << 4)|(1234 << 4)
define i32 @test14(i32 %A) {
-; CHECK: @test14
+; CHECK-LABEL: @test14(
; CHECK-NEXT: %B = and i32 %A, -19760
; CHECK-NEXT: or i32 %B, 19744
; CHECK-NEXT: ret i32
;; D = ((B | 1234) << 4) === ((B << 4)|(1234 << 4)
define i32 @test14a(i32 %A) {
-; CHECK: @test14a
+; CHECK-LABEL: @test14a(
; CHECK-NEXT: and i32 %A, 77
; CHECK-NEXT: ret i32
%B = shl i32 %A, 4 ; <i32> [#uses=1]
}
define i32 @test15(i1 %C) {
-; CHECK: @test15
+; CHECK-LABEL: @test15(
; CHECK-NEXT: select i1 %C, i32 12, i32 4
; CHECK-NEXT: ret i32
%A = select i1 %C, i32 3, i32 1 ; <i32> [#uses=1]
}
define i32 @test15a(i1 %C) {
-; CHECK: @test15a
+; CHECK-LABEL: @test15a(
; CHECK-NEXT: select i1 %C, i32 512, i32 128
; CHECK-NEXT: ret i32
%A = select i1 %C, i8 3, i8 1 ; <i8> [#uses=1]
}
define i1 @test16(i32 %X) {
-; CHECK: @test16
+; CHECK-LABEL: @test16(
; CHECK-NEXT: and i32 %X, 16
; CHECK-NEXT: icmp ne i32
; CHECK-NEXT: ret i1
- %tmp.3 = ashr i32 %X, 4
+ %tmp.3 = ashr i32 %X, 4
%tmp.6 = and i32 %tmp.3, 1
%tmp.7 = icmp ne i32 %tmp.6, 0
ret i1 %tmp.7
}
define i1 @test17(i32 %A) {
-; CHECK: @test17
+; CHECK-LABEL: @test17(
; CHECK-NEXT: and i32 %A, -8
; CHECK-NEXT: icmp eq i32
; CHECK-NEXT: ret i1
define i1 @test18(i8 %A) {
-; CHECK: @test18
+; CHECK-LABEL: @test18(
; CHECK: ret i1 false
%B = lshr i8 %A, 7 ; <i8> [#uses=1]
}
define i1 @test19(i32 %A) {
-; CHECK: @test19
+; CHECK-LABEL: @test19(
; CHECK-NEXT: icmp ult i32 %A, 4
; CHECK-NEXT: ret i1
%B = ashr i32 %A, 2 ; <i32> [#uses=1]
define i1 @test19a(i32 %A) {
-; CHECK: @test19a
-; CHECK-NEXT: and i32 %A, -4
-; CHECK-NEXT: icmp eq i32
+; CHECK-LABEL: @test19a(
+; CHECK-NEXT: icmp ugt i32 %A, -5
; CHECK-NEXT: ret i1
%B = ashr i32 %A, 2 ; <i32> [#uses=1]
- ;; (X & -4) == -4
+ ;; X >u ~4
%C = icmp eq i32 %B, -1 ; <i1> [#uses=1]
ret i1 %C
}
define i1 @test20(i8 %A) {
-; CHECK: @test20
+; CHECK-LABEL: @test20(
; CHECK: ret i1 false
%B = ashr i8 %A, 7 ; <i8> [#uses=1]
;; false
}
define i1 @test21(i8 %A) {
-; CHECK: @test21
+; CHECK-LABEL: @test21(
; CHECK-NEXT: and i8 %A, 15
; CHECK-NEXT: icmp eq i8
; CHECK-NEXT: ret i1
}
define i1 @test22(i8 %A) {
-; CHECK: @test22
+; CHECK-LABEL: @test22(
; CHECK-NEXT: and i8 %A, 15
; CHECK-NEXT: icmp eq i8
; CHECK-NEXT: ret i1
}
define i8 @test23(i32 %A) {
-; CHECK: @test23
+; CHECK-LABEL: @test23(
; CHECK-NEXT: trunc i32 %A to i8
; CHECK-NEXT: ret i8
}
define i8 @test24(i8 %X) {
-; CHECK: @test24
+; CHECK-LABEL: @test24(
; CHECK-NEXT: and i8 %X, 3
; CHECK-NEXT: ret i8
%Y = and i8 %X, -5 ; <i8> [#uses=1]
}
define i32 @test25(i32 %tmp.2, i32 %AA) {
-; CHECK: @test25
+; CHECK-LABEL: @test25(
; CHECK-NEXT: and i32 %tmp.2, -131072
; CHECK-NEXT: add i32 %{{[^,]*}}, %AA
; CHECK-NEXT: and i32 %{{[^,]*}}, -131072
ret i32 %tmp.6
}
+define <2 x i32> @test25_vector(<2 x i32> %tmp.2, <2 x i32> %AA) {
+; CHECK-LABEL: @test25_vector(
+; CHECK: %tmp.3 = lshr <2 x i32> %tmp.2, <i32 17, i32 17>
+; CHECK-NEXT: shl <2 x i32> %tmp.3, <i32 17, i32 17>
+; CHECK-NEXT: add <2 x i32> %tmp.51, %AA
+; CHECK-NEXT: and <2 x i32> %x2, <i32 -131072, i32 -131072>
+; CHECK-NEXT: ret <2 x i32>
+ %x = lshr <2 x i32> %AA, <i32 17, i32 17>
+ %tmp.3 = lshr <2 x i32> %tmp.2, <i32 17, i32 17>
+ %tmp.5 = add <2 x i32> %tmp.3, %x
+ %tmp.6 = shl <2 x i32> %tmp.5, <i32 17, i32 17>
+ ret <2 x i32> %tmp.6
+}
+
;; handle casts between shifts.
define i32 @test26(i32 %A) {
-; CHECK: @test26
+; CHECK-LABEL: @test26(
; CHECK-NEXT: and i32 %A, -2
; CHECK-NEXT: ret i32
%B = lshr i32 %A, 1 ; <i32> [#uses=1]
define i1 @test27(i32 %x) nounwind {
-; CHECK: @test27
+; CHECK-LABEL: @test27(
; CHECK-NEXT: and i32 %x, 8
; CHECK-NEXT: icmp ne i32
; CHECK-NEXT: ret i1
%z = trunc i32 %y to i1
ret i1 %z
}
-
+
define i8 @test28(i8 %x) {
entry:
-; CHECK: @test28
+; CHECK-LABEL: @test28(
; CHECK: icmp slt i8 %x, 0
-; CHECK-NEXT: br i1
+; CHECK-NEXT: br i1
%tmp1 = lshr i8 %x, 7
%cond1 = icmp ne i8 %tmp1, 0
br i1 %cond1, label %bb1, label %bb2
define i8 @test28a(i8 %x, i8 %y) {
entry:
; This shouldn't be transformed.
-; CHECK: @test28a
+; CHECK-LABEL: @test28a(
; CHECK: %tmp1 = lshr i8 %x, 7
; CHECK: %cond1 = icmp eq i8 %tmp1, 0
; CHECK: br i1 %cond1, label %bb2, label %bb1
%tmp917 = trunc i64 %tmp916 to i32
%tmp10 = lshr i32 %tmp917, 31
ret i32 %tmp10
-; CHECK: @test29
+; CHECK-LABEL: @test29(
; CHECK: %tmp916 = lshr i64 %d18, 63
; CHECK: %tmp10 = trunc i64 %tmp916 to i32
}
%Y = shl i32 %B, %C
%Z = and i32 %X, %Y
ret i32 %Z
-; CHECK: @test30
+; CHECK-LABEL: @test30(
; CHECK: %X1 = and i32 %A, %B
; CHECK: %Z = shl i32 %X1, %C
}
%Y = lshr i32 %B, %C
%Z = or i32 %X, %Y
ret i32 %Z
-; CHECK: @test31
+; CHECK-LABEL: @test31(
; CHECK: %X1 = or i32 %A, %B
; CHECK: %Z = lshr i32 %X1, %C
}
%Y = ashr i32 %B, %C
%Z = xor i32 %X, %Y
ret i32 %Z
-; CHECK: @test32
+; CHECK-LABEL: @test32(
; CHECK: %X1 = xor i32 %A, %B
; CHECK: %Z = ashr i32 %X1, %C
; CHECK: ret i32 %Z
%tmp1 = shl i32 %X, 7
%tmp2 = icmp slt i32 %tmp1, 0
ret i1 %tmp2
-; CHECK: @test33
+; CHECK-LABEL: @test33(
; CHECK: %tmp1.mask = and i32 %X, 16777216
; CHECK: %tmp2 = icmp ne i32 %tmp1.mask, 0
}
%tmp1 = lshr i32 %X, 7
%tmp2 = icmp slt i32 %tmp1, 0
ret i1 %tmp2
-; CHECK: @test34
+; CHECK-LABEL: @test34(
; CHECK: ret i1 false
}
%tmp1 = ashr i32 %X, 7
%tmp2 = icmp slt i32 %tmp1, 0
ret i1 %tmp2
-; CHECK: @test35
+; CHECK-LABEL: @test35(
; CHECK: %tmp2 = icmp slt i32 %X, 0
; CHECK: ret i1 %tmp2
}
%ins = or i128 %tmp23, %tmp27
%tmp45 = lshr i128 %ins, 64
ret i128 %tmp45
-
-; CHECK: @test36
+
+; CHECK-LABEL: @test36(
; CHECK: %tmp231 = or i128 %B, %A
; CHECK: %ins = and i128 %tmp231, 18446744073709551615
; CHECK: ret i128 %ins
%tmp45 = lshr i128 %ins, 64
%tmp46 = trunc i128 %tmp45 to i64
ret i64 %tmp46
-
-; CHECK: @test37
+
+; CHECK-LABEL: @test37(
; CHECK: %tmp23 = shl nuw nsw i128 %tmp22, 32
; CHECK: %ins = or i128 %tmp23, %A
; CHECK: %tmp46 = trunc i128 %ins to i64
%rem = srem i32 %x, 32
%shl = shl i32 1, %rem
ret i32 %shl
-; CHECK: @test38
+; CHECK-LABEL: @test38(
; CHECK-NEXT: and i32 %x, 31
; CHECK-NEXT: shl i32 1
; CHECK-NEXT: ret i32
}
; <rdar://problem/8756731>
-; CHECK: @test39
+; CHECK-LABEL: @test39(
define i8 @test39(i32 %a0) {
entry:
%tmp4 = trunc i32 %a0 to i8
%tmp51 = xor i8 %tmp50, %tmp5
%tmp52 = and i8 %tmp51, -128
%tmp53 = lshr i8 %tmp52, 7
-; CHECK: lshr i8 %tmp51, 7
%tmp54 = mul i8 %tmp53, 16
-; CHECK: shl nuw nsw i8 %tmp53, 4
+; CHECK: %0 = shl i8 %tmp4, 2
+; CHECK: %tmp54 = and i8 %0, 16
%tmp55 = xor i8 %tmp54, %tmp51
; CHECK: ret i8 %tmp551
ret i8 %tmp55
%shl2 = shl i32 %shl1, 2
%div = udiv i32 %a, %shl2
ret i32 %div
-; CHECK: @test40
+; CHECK-LABEL: @test40(
; CHECK-NEXT: add i32 %b, 2
; CHECK-NEXT: lshr i32 %a
; CHECK-NEXT: ret i32
%1 = shl i32 1, %b
%2 = shl i32 %1, 3
ret i32 %2
-; CHECK: @test41
+; CHECK-LABEL: @test41(
; CHECK-NEXT: shl i32 8, %b
; CHECK-NEXT: ret i32
}
%div = lshr i32 4096, %b ; must be exact otherwise we'd divide by zero
%div2 = udiv i32 %a, %div
ret i32 %div2
-; CHECK: @test42
+; CHECK-LABEL: @test42(
; CHECK-NEXT: lshr exact i32 4096, %b
}
%div = shl i32 4096, %b ; must be exact otherwise we'd divide by zero
%div2 = udiv i32 %a, %div
ret i32 %div2
-; CHECK: @test43
+; CHECK-LABEL: @test43(
; CHECK-NEXT: add i32 %b, 12
; CHECK-NEXT: lshr
; CHECK-NEXT: ret
%y = shl nuw i32 %a, 1
%z = shl i32 %y, 4
ret i32 %z
-; CHECK: @test44
+; CHECK-LABEL: @test44(
; CHECK-NEXT: %y = shl i32 %a, 5
; CHECK-NEXT: ret i32 %y
}
%y = lshr exact i32 %a, 1
%z = lshr i32 %y, 4
ret i32 %z
-; CHECK: @test45
+; CHECK-LABEL: @test45(
; CHECK-NEXT: %y = lshr i32 %a, 5
; CHECK-NEXT: ret i32 %y
}
%y = ashr exact i32 %a, 3
%z = shl i32 %y, 1
ret i32 %z
-; CHECK: @test46
+; CHECK-LABEL: @test46(
; CHECK-NEXT: %z = ashr exact i32 %a, 2
; CHECK-NEXT: ret i32 %z
}
%y = lshr exact i32 %a, 3
%z = shl i32 %y, 1
ret i32 %z
-; CHECK: @test47
+; CHECK-LABEL: @test47(
; CHECK-NEXT: %z = lshr exact i32 %a, 2
; CHECK-NEXT: ret i32 %z
}
%A = lshr exact i32 %x, 1
%B = shl i32 %A, 3
ret i32 %B
-; CHECK: @test48
+; CHECK-LABEL: @test48(
; CHECK-NEXT: %B = shl i32 %x, 2
; CHECK-NEXT: ret i32 %B
}
%A = ashr exact i32 %x, 1
%B = shl i32 %A, 3
ret i32 %B
-; CHECK: @test49
+; CHECK-LABEL: @test49(
; CHECK-NEXT: %B = shl i32 %x, 2
; CHECK-NEXT: ret i32 %B
}
%A = shl nsw i32 %x, 1
%B = ashr i32 %A, 3
ret i32 %B
-; CHECK: @test50
+; CHECK-LABEL: @test50(
; CHECK-NEXT: %B = ashr i32 %x, 2
; CHECK-NEXT: ret i32 %B
}
%A = shl nuw i32 %x, 1
%B = lshr i32 %A, 3
ret i32 %B
-; CHECK: @test51
+; CHECK-LABEL: @test51(
; CHECK-NEXT: %B = lshr i32 %x, 2
; CHECK-NEXT: ret i32 %B
}
%A = shl nsw i32 %x, 3
%B = ashr i32 %A, 1
ret i32 %B
-; CHECK: @test52
+; CHECK-LABEL: @test52(
; CHECK-NEXT: %B = shl nsw i32 %x, 2
; CHECK-NEXT: ret i32 %B
}
%A = shl nuw i32 %x, 3
%B = lshr i32 %A, 1
ret i32 %B
-; CHECK: @test53
+; CHECK-LABEL: @test53(
; CHECK-NEXT: %B = shl nuw i32 %x, 2
; CHECK-NEXT: ret i32 %B
}
%shl = shl i32 %shr2, 4
%and = and i32 %shl, 16
ret i32 %and
-; CHECK: @test54
+; CHECK-LABEL: @test54(
; CHECK: shl i32 %x, 3
}
%shl = shl i32 %shr2, 4
%or = or i32 %shl, 8
ret i32 %or
-; CHECK: @test55
+; CHECK-LABEL: @test55(
; CHECK: shl i32 %x, 3
}
%shl = shl i32 %shr2, 4
%or = or i32 %shl, 7
ret i32 %or
-; CHECK: @test56
+; CHECK-LABEL: @test56(
; CHECK: shl i32 %shr2, 4
}
%shl = shl i32 %shr, 4
%and = and i32 %shl, 16
ret i32 %and
-; CHECK: @test57
+; CHECK-LABEL: @test57(
; CHECK: shl i32 %x, 3
}
%shl = shl i32 %shr, 4
%or = or i32 %shl, 8
ret i32 %or
-; CHECK: @test58
+; CHECK-LABEL: @test58(
; CHECK: shl i32 %x, 3
}
%shl = shl i32 %shr, 4
%or = or i32 %shl, 7
ret i32 %or
-; CHECK: @test59
+; CHECK-LABEL: @test59(
; CHECK: %shl = shl i32 %shr1, 4
}
%shl = shl i32 %shr, 1
%or = or i32 %shl, 1
ret i32 %or
-; CHECK: @test60
-; CHECK: lshr i32 %x, 3
+; CHECK-LABEL: @test60(
+; CHECK: ashr i32 %x, 3
}
%shl = shl i32 %shr, 1
%or = or i32 %shl, 2
ret i32 %or
-; CHECK: @test61
+; CHECK-LABEL: @test61(
; CHECK: ashr i32 %x, 4
}
+
+; propagate "exact" trait
+define i32 @test62(i32 %x) {
+ %shr = ashr exact i32 %x, 4
+ %shl = shl i32 %shr, 1
+ %or = or i32 %shl, 1
+ ret i32 %or
+; CHECK-LABEL: @test62(
+; CHECK: ashr exact i32 %x, 3
+}
+
+; PR17026
+; CHECK-LABEL: @test63(
+; CHECK-NOT: sh
+; CHECK: ret
+define void @test63(i128 %arg) {
+bb:
+ br i1 undef, label %bb1, label %bb12
+
+bb1: ; preds = %bb11, %bb
+ br label %bb2
+
+bb2: ; preds = %bb7, %bb1
+ br i1 undef, label %bb3, label %bb7
+
+bb3: ; preds = %bb2
+ %tmp = lshr i128 %arg, 36893488147419103232
+ %tmp4 = shl i128 %tmp, 0
+ %tmp5 = or i128 %tmp4, undef
+ %tmp6 = trunc i128 %tmp5 to i16
+ br label %bb8
+
+bb7: ; preds = %bb2
+ br i1 undef, label %bb8, label %bb2
+
+bb8: ; preds = %bb7, %bb3
+ %tmp9 = phi i16 [ %tmp6, %bb3 ], [ undef, %bb7 ]
+ %tmp10 = icmp eq i16 %tmp9, 0
+ br i1 %tmp10, label %bb11, label %bb12
+
+bb11: ; preds = %bb8
+ br i1 undef, label %bb1, label %bb12
+
+bb12: ; preds = %bb11, %bb8, %bb
+ ret void
+}
+
+define i32 @test64(i32 %a) {
+; CHECK-LABEL: @test64(
+; CHECK-NEXT: ret i32 undef
+ %b = ashr i32 %a, 32 ; shift all bits out
+ ret i32 %b
+}
+
+define <4 x i32> @test64_splat_vector(<4 x i32> %a) {
+; CHECK-LABEL: @test64_splat_vector
+; CHECK-NEXT: ret <4 x i32> undef
+ %b = ashr <4 x i32> %a, <i32 32, i32 32, i32 32, i32 32> ; shift all bits out
+ ret <4 x i32> %b
+}
+
+define <4 x i32> @test64_non_splat_vector(<4 x i32> %a) {
+; CHECK-LABEL: @test64_non_splat_vector
+; CHECK-NOT: ret <4 x i32> undef
+ %b = ashr <4 x i32> %a, <i32 32, i32 0, i32 1, i32 2> ; shift all bits out
+ ret <4 x i32> %b
+}
+
+define <2 x i65> @test_65(<2 x i64> %t) {
+; CHECK-LABEL: @test_65
+ %a = zext <2 x i64> %t to <2 x i65>
+ %sext = shl <2 x i65> %a, <i65 33, i65 33>
+ %b = ashr <2 x i65> %sext, <i65 33, i65 33>
+ ret <2 x i65> %b
+}