llvm/test/Transforms/InstCombine/phi-extractvalue.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=instcombine < %s | FileCheck %s

declare void @usei32(i32)

; If we have a phi of extractvalues, we can sink it,
; Here, we only need a PHI for extracted values.
define i32 @test0({ i32, i32 } %agg_left, { i32, i32 } %agg_right, i1 %c) {
; CHECK-LABEL: @test0(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[AGG_LEFT_PN:%.*]] = phi { i32, i32 } [ [[AGG_LEFT:%.*]], [[LEFT]] ], [ [[AGG_RIGHT:%.*]], [[RIGHT]] ]
; CHECK-NEXT:    [[R:%.*]] = extractvalue { i32, i32 } [[AGG_LEFT_PN]], 0
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue { i32, i32 } %agg_left, 0
  br label %end

right:
  %i1 = extractvalue { i32, i32 } %agg_right, 0
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}

; But only if the extractvalues have no extra uses
define i32 @test1_extrause0({ i32, i32 } %agg_left, { i32, i32 } %agg_right, i1 %c) {
; CHECK-LABEL: @test1_extrause0(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { i32, i32 } [[AGG_LEFT:%.*]], 0
; CHECK-NEXT:    call void @usei32(i32 [[I0]])
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { i32, i32 } [[AGG_RIGHT:%.*]], 0
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue { i32, i32 } %agg_left, 0
  call void  @usei32(i32 %i0)
  br label %end

right:
  %i1 = extractvalue { i32, i32 } %agg_right, 0
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}
define i32 @test2_extrause1({ i32, i32 } %agg_left, { i32, i32 } %agg_right, i1 %c) {
; CHECK-LABEL: @test2_extrause1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { i32, i32 } [[AGG_LEFT:%.*]], 0
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { i32, i32 } [[AGG_RIGHT:%.*]], 0
; CHECK-NEXT:    call void @usei32(i32 [[I1]])
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue { i32, i32 } %agg_left, 0
  br label %end

right:
  %i1 = extractvalue { i32, i32 } %agg_right, 0
  call void  @usei32(i32 %i1)
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}
define i32 @test3_extrause2({ i32, i32 } %agg_left, { i32, i32 } %agg_right, i1 %c) {
; CHECK-LABEL: @test3_extrause2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { i32, i32 } [[AGG_LEFT:%.*]], 0
; CHECK-NEXT:    call void @usei32(i32 [[I0]])
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { i32, i32 } [[AGG_RIGHT:%.*]], 0
; CHECK-NEXT:    call void @usei32(i32 [[I1]])
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue { i32, i32 } %agg_left, 0
  call void  @usei32(i32 %i0)
  br label %end

right:
  %i1 = extractvalue { i32, i32 } %agg_right, 0
  call void  @usei32(i32 %i1)
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}

; But the indices must match
define i32 @test4({ i32, i32 } %agg_left, { i32, i32 } %agg_right, i1 %c) {
; CHECK-LABEL: @test4(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { i32, i32 } [[AGG_LEFT:%.*]], 0
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { i32, i32 } [[AGG_RIGHT:%.*]], 1
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue { i32, i32 } %agg_left, 0
  br label %end

right:
  %i1 = extractvalue { i32, i32 } %agg_right, 1
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}

; More complex aggregates are fine, too, as long as indices match.
define i32 @test5({{ i32, i32 }, { i32, i32 }} %agg_left, {{ i32, i32 }, { i32, i32 }} %agg_right, i1 %c) {
; CHECK-LABEL: @test5(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[AGG_LEFT_PN:%.*]] = phi { { i32, i32 }, { i32, i32 } } [ [[AGG_LEFT:%.*]], [[LEFT]] ], [ [[AGG_RIGHT:%.*]], [[RIGHT]] ]
; CHECK-NEXT:    [[R:%.*]] = extractvalue { { i32, i32 }, { i32, i32 } } [[AGG_LEFT_PN]], 0, 0
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue {{ i32, i32 }, { i32, i32 }} %agg_left, 0, 0
  br label %end

right:
  %i1 = extractvalue {{ i32, i32 }, { i32, i32 }} %agg_right, 0, 0
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}

; The indices must fully match, on all levels.
define i32 @test6({{ i32, i32 }, { i32, i32 }} %agg_left, {{ i32, i32 }, { i32, i32 }} %agg_right, i1 %c) {
; CHECK-LABEL: @test6(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { { i32, i32 }, { i32, i32 } } [[AGG_LEFT:%.*]], 0, 0
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { { i32, i32 }, { i32, i32 } } [[AGG_RIGHT:%.*]], 0, 1
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue {{ i32, i32 }, { i32, i32 }} %agg_left, 0, 0
  br label %end

right:
  %i1 = extractvalue {{ i32, i32 }, { i32, i32 }} %agg_right, 0, 1
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}
define i32 @test7({{ i32, i32 }, { i32, i32 }} %agg_left, {{ i32, i32 }, { i32, i32 }} %agg_right, i1 %c) {
; CHECK-LABEL: @test7(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { { i32, i32 }, { i32, i32 } } [[AGG_LEFT:%.*]], 0, 0
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { { i32, i32 }, { i32, i32 } } [[AGG_RIGHT:%.*]], 1, 0
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue {{ i32, i32 }, { i32, i32 }} %agg_left, 0, 0
  br label %end

right:
  %i1 = extractvalue {{ i32, i32 }, { i32, i32 }} %agg_right, 1, 0
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}
define i32 @test8({{ i32, i32 }, { i32, i32 }} %agg_left, {{ i32, i32 }, { i32, i32 }} %agg_right, i1 %c) {
; CHECK-LABEL: @test8(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { { i32, i32 }, { i32, i32 } } [[AGG_LEFT:%.*]], 0, 0
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { { i32, i32 }, { i32, i32 } } [[AGG_RIGHT:%.*]], 1, 1
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue {{ i32, i32 }, { i32, i32 }} %agg_left, 0, 0
  br label %end

right:
  %i1 = extractvalue {{ i32, i32 }, { i32, i32 }} %agg_right, 1, 1
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}

; Also, unlike PHI-of-insertvalues, here the base aggregates of extractvalue
; can have different types, and just checking the indices is not enough.
define i32 @test9({ i32, i32 } %agg_left, { i32, { i32, i32 } } %agg_right, i1 %c) {
; CHECK-LABEL: @test9(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { i32, i32 } [[AGG_LEFT:%.*]], 0
; CHECK-NEXT:    br label [[END:%.*]]
; CHECK:       right:
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { i32, { i32, i32 } } [[AGG_RIGHT:%.*]], 0
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br i1 %c, label %left, label %right

left:
  %i0 = extractvalue { i32, i32 } %agg_left, 0
  br label %end

right:
  %i1 = extractvalue { i32, { i32, i32 } } %agg_right, 0
  br label %end

end:
  %r = phi i32 [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}

; It is fine if there are multiple uses of the PHI's value, as long as they are all in the PHI node itself
define i32 @test10({ i32, i32 } %agg_left, { i32, i32 } %agg_right, i1 %c0, i1 %c1) {
; CHECK-LABEL: @test10(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 [[C0:%.*]], label [[END:%.*]], label [[DISPATCH:%.*]]
; CHECK:       dispatch:
; CHECK-NEXT:    br i1 [[C1:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    br label [[END]]
; CHECK:       right:
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[AGG_LEFT_PN:%.*]] = phi { i32, i32 } [ [[AGG_LEFT:%.*]], [[ENTRY:%.*]] ], [ [[AGG_LEFT]], [[LEFT]] ], [ [[AGG_RIGHT:%.*]], [[RIGHT]] ]
; CHECK-NEXT:    [[R:%.*]] = extractvalue { i32, i32 } [[AGG_LEFT_PN]], 0
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  %i0 = extractvalue { i32, i32 } %agg_left, 0
  %i1 = extractvalue { i32, i32 } %agg_right, 0
  br i1 %c0, label %end, label %dispatch

dispatch:
  br i1 %c1, label %left, label %right

left:
  br label %end

right:
  br label %end

end:
  %r = phi i32 [ %i0, %entry ], [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}
; Which isn't the case here, there is a legitimate external use.
define i32 @test11({ i32, i32 } %agg_left, { i32, i32 } %agg_right, i1 %c0, i1 %c1) {
; CHECK-LABEL: @test11(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[I0:%.*]] = extractvalue { i32, i32 } [[AGG_LEFT:%.*]], 0
; CHECK-NEXT:    [[I1:%.*]] = extractvalue { i32, i32 } [[AGG_RIGHT:%.*]], 0
; CHECK-NEXT:    call void @usei32(i32 [[I0]])
; CHECK-NEXT:    br i1 [[C0:%.*]], label [[END:%.*]], label [[DISPATCH:%.*]]
; CHECK:       dispatch:
; CHECK-NEXT:    br i1 [[C1:%.*]], label [[LEFT:%.*]], label [[RIGHT:%.*]]
; CHECK:       left:
; CHECK-NEXT:    br label [[END]]
; CHECK:       right:
; CHECK-NEXT:    br label [[END]]
; CHECK:       end:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[I0]], [[ENTRY:%.*]] ], [ [[I0]], [[LEFT]] ], [ [[I1]], [[RIGHT]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  %i0 = extractvalue { i32, i32 } %agg_left, 0
  %i1 = extractvalue { i32, i32 } %agg_right, 0
  call void @usei32(i32 %i0)
  br i1 %c0, label %end, label %dispatch

dispatch:
  br i1 %c1, label %left, label %right

left:
  br label %end

right:
  br label %end

end:
  %r = phi i32 [ %i0, %entry ], [ %i0, %left ], [ %i1, %right ]
  ret i32 %r
}

define i32 @extractvalue_of_constant_phi(i1 %c) {
; CHECK-LABEL: @extractvalue_of_constant_phi(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK:       if:
; CHECK-NEXT:    br label [[JOIN:%.*]]
; CHECK:       else:
; CHECK-NEXT:    br label [[JOIN]]
; CHECK:       join:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 1, [[IF]] ], [ 3, [[ELSE]] ]
; CHECK-NEXT:    ret i32 [[PHI]]
;
  br i1 %c, label %if, label %else

if:
  br label %join

else:
  br label %join

join:
  %phi = phi { i32, i32 } [ { i32 1, i32 2 }, %if ], [ { i32 3, i32 4 }, %else ]
  %ev = extractvalue { i32, i32 } %phi, 0
  ret i32 %ev
}

define i32 @extractvalue_of_one_constant_phi(i1 %c, { i32, i32 } %arg) {
; CHECK-LABEL: @extractvalue_of_one_constant_phi(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK:       if:
; CHECK-NEXT:    [[TMP1:%.*]] = extractvalue { i32, i32 } [[ARG:%.*]], 0
; CHECK-NEXT:    br label [[JOIN:%.*]]
; CHECK:       else:
; CHECK-NEXT:    br label [[JOIN]]
; CHECK:       join:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ [[TMP1]], [[IF]] ], [ 3, [[ELSE]] ]
; CHECK-NEXT:    ret i32 [[PHI]]
;
  br i1 %c, label %if, label %else

if:
  br label %join

else:
  br label %join

join:
  %phi = phi { i32, i32 } [ %arg, %if ], [ { i32 3, i32 4 }, %else ]
  %ev = extractvalue { i32, i32 } %phi, 0
  ret i32 %ev
}

define i32 @extractvalue_of_constant_phi_multi_index(i1 %c) {
; CHECK-LABEL: @extractvalue_of_constant_phi_multi_index(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK:       if:
; CHECK-NEXT:    br label [[JOIN:%.*]]
; CHECK:       else:
; CHECK-NEXT:    br label [[JOIN]]
; CHECK:       join:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ 3, [[IF]] ], [ 6, [[ELSE]] ]
; CHECK-NEXT:    ret i32 [[PHI]]
;
  br i1 %c, label %if, label %else

if:
  br label %join

else:
  br label %join

join:
  %phi = phi { i32, { i32, i32 } } [ { i32 1, { i32, i32 } { i32 2, i32 3 } }, %if ], [ { i32 4, { i32, i32 } { i32 5, i32 6 } }, %else ]
  %ev = extractvalue { i32, { i32, i32 } } %phi, 1, 1
  ret i32 %ev
}

define i32 @extractvalue_of_one_constant_phi_multi_index(i1 %c, { i32, { i32, i32 } } %arg) {
; CHECK-LABEL: @extractvalue_of_one_constant_phi_multi_index(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK:       if:
; CHECK-NEXT:    [[TMP1:%.*]] = extractvalue { i32, { i32, i32 } } [[ARG:%.*]], 1, 1
; CHECK-NEXT:    br label [[JOIN:%.*]]
; CHECK:       else:
; CHECK-NEXT:    br label [[JOIN]]
; CHECK:       join:
; CHECK-NEXT:    [[PHI:%.*]] = phi i32 [ [[TMP1]], [[IF]] ], [ 6, [[ELSE]] ]
; CHECK-NEXT:    ret i32 [[PHI]]
;
  br i1 %c, label %if, label %else

if:
  br label %join

else:
  br label %join

join:
  %phi = phi { i32, { i32, i32 } } [ %arg, %if ], [ { i32 4, { i32, i32 } { i32 5, i32 6 } }, %else ]
  %ev = extractvalue { i32, { i32, i32 } } %phi, 1, 1
  ret i32 %ev
}

define i32 @extractvalue_of_constant_phi_multiuse(i1 %c) {
; CHECK-LABEL: @extractvalue_of_constant_phi_multiuse(
; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]]
; CHECK:       if:
; CHECK-NEXT:    br label [[JOIN:%.*]]
; CHECK:       else:
; CHECK-NEXT:    br label [[JOIN]]
; CHECK:       join:
; CHECK-NEXT:    [[PHI:%.*]] = phi { i32, i32 } [ { i32 1, i32 2 }, [[IF]] ], [ { i32 3, i32 4 }, [[ELSE]] ]
; CHECK-NEXT:    [[EV0:%.*]] = extractvalue { i32, i32 } [[PHI]], 0
; CHECK-NEXT:    [[EV1:%.*]] = extractvalue { i32, i32 } [[PHI]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[EV0]], [[EV1]]
; CHECK-NEXT:    ret i32 [[ADD]]
;
  br i1 %c, label %if, label %else

if:
  br label %join

else:
  br label %join

join:
  %phi = phi { i32, i32 } [ { i32 1, i32 2 }, %if ], [ { i32 3, i32 4 }, %else ]
  %ev0 = extractvalue { i32, i32 } %phi, 0
  %ev1 = extractvalue { i32, i32 } %phi, 1
  %add = add i32 %ev0, %ev1
  ret i32 %add
}