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llvm-project/llvm/test/Transforms/SCCP/undef-resolve.ll

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -sccp -S < %s | FileCheck %s
; PR6940
define double @test1() {
; CHECK-LABEL: @test1(
; CHECK-NEXT: [[T:%.*]] = sitofp i32 undef to double
; CHECK-NEXT: ret double [[T]]
;
%t = sitofp i32 undef to double
ret double %t
}
; rdar://7832370
; Check that lots of stuff doesn't get turned into undef.
define i32 @test2() nounwind readnone ssp {
; CHECK-LABEL: @test2(
; CHECK-NEXT: init:
; CHECK-NEXT: br label [[CONTROL_OUTER_OUTER:%.*]]
; CHECK: control.outer.loopexit.us-lcssa:
; CHECK-NEXT: br label [[CONTROL_OUTER_LOOPEXIT:%.*]]
; CHECK: control.outer.loopexit:
; CHECK-NEXT: br label [[CONTROL_OUTER_OUTER_BACKEDGE:%.*]]
; CHECK: control.outer.outer:
; CHECK-NEXT: [[SWITCHCOND_0_PH_PH:%.*]] = phi i32 [ 2, [[INIT:%.*]] ], [ 3, [[CONTROL_OUTER_OUTER_BACKEDGE]] ]
; CHECK-NEXT: [[I_0_PH_PH:%.*]] = phi i32 [ undef, [[INIT]] ], [ [[I_0_PH_PH_BE:%.*]], [[CONTROL_OUTER_OUTER_BACKEDGE]] ]
; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i32 [[I_0_PH_PH]], 0
; CHECK-NEXT: br i1 [[TMP4]], label [[CONTROL_OUTER_OUTER_SPLIT_US:%.*]], label [[CONTROL_OUTER_OUTER_CONTROL_OUTER_OUTER_SPLIT_CRIT_EDGE:%.*]]
; CHECK: control.outer.outer.control.outer.outer.split_crit_edge:
; CHECK-NEXT: br label [[CONTROL_OUTER:%.*]]
; CHECK: control.outer.outer.split.us:
; CHECK-NEXT: br label [[CONTROL_OUTER_US:%.*]]
; CHECK: control.outer.us:
; CHECK-NEXT: [[A_0_PH_US:%.*]] = phi i32 [ [[SWITCHCOND_0_US:%.*]], [[BB3_US:%.*]] ], [ 4, [[CONTROL_OUTER_OUTER_SPLIT_US]] ]
; CHECK-NEXT: [[SWITCHCOND_0_PH_US:%.*]] = phi i32 [ [[A_0_PH_US]], [[BB3_US]] ], [ [[SWITCHCOND_0_PH_PH]], [[CONTROL_OUTER_OUTER_SPLIT_US]] ]
; CHECK-NEXT: br label [[CONTROL_US:%.*]]
; CHECK: bb3.us:
; CHECK-NEXT: br label [[CONTROL_OUTER_US]]
; CHECK: bb0.us:
; CHECK-NEXT: br label [[CONTROL_US]]
; CHECK: control.us:
; CHECK-NEXT: [[SWITCHCOND_0_US]] = phi i32 [ [[A_0_PH_US]], [[BB0_US:%.*]] ], [ [[SWITCHCOND_0_PH_US]], [[CONTROL_OUTER_US]] ]
; CHECK-NEXT: switch i32 [[SWITCHCOND_0_US]], label [[CONTROL_OUTER_LOOPEXIT_US_LCSSA_US:%.*]] [
; CHECK-NEXT: i32 0, label [[BB0_US]]
; CHECK-NEXT: i32 1, label [[BB1_US_LCSSA_US:%.*]]
; CHECK-NEXT: i32 3, label [[BB3_US]]
; CHECK-NEXT: i32 4, label [[BB4_US_LCSSA_US:%.*]]
; CHECK-NEXT: ]
; CHECK: control.outer.loopexit.us-lcssa.us:
; CHECK-NEXT: br label [[CONTROL_OUTER_LOOPEXIT]]
; CHECK: bb1.us-lcssa.us:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb4.us-lcssa.us:
; CHECK-NEXT: br label [[BB4:%.*]]
; CHECK: control.outer:
; CHECK-NEXT: [[A_0_PH:%.*]] = phi i32 [ [[NEXTID17:%.*]], [[BB3:%.*]] ], [ 4, [[CONTROL_OUTER_OUTER_CONTROL_OUTER_OUTER_SPLIT_CRIT_EDGE]] ]
; CHECK-NEXT: [[SWITCHCOND_0_PH:%.*]] = phi i32 [ 0, [[BB3]] ], [ [[SWITCHCOND_0_PH_PH]], [[CONTROL_OUTER_OUTER_CONTROL_OUTER_OUTER_SPLIT_CRIT_EDGE]] ]
; CHECK-NEXT: br label [[CONTROL:%.*]]
; CHECK: control:
; CHECK-NEXT: [[SWITCHCOND_0:%.*]] = phi i32 [ [[A_0_PH]], [[BB0:%.*]] ], [ [[SWITCHCOND_0_PH]], [[CONTROL_OUTER]] ]
; CHECK-NEXT: switch i32 [[SWITCHCOND_0]], label [[CONTROL_OUTER_LOOPEXIT_US_LCSSA:%.*]] [
; CHECK-NEXT: i32 0, label [[BB0]]
; CHECK-NEXT: i32 1, label [[BB1_US_LCSSA:%.*]]
; CHECK-NEXT: i32 3, label [[BB3]]
; CHECK-NEXT: i32 4, label [[BB4_US_LCSSA:%.*]]
; CHECK-NEXT: ]
; CHECK: bb4.us-lcssa:
; CHECK-NEXT: br label [[BB4]]
; CHECK: bb4:
; CHECK-NEXT: br label [[CONTROL_OUTER_OUTER_BACKEDGE]]
; CHECK: control.outer.outer.backedge:
; CHECK-NEXT: [[I_0_PH_PH_BE]] = phi i32 [ 1, [[BB4]] ], [ 0, [[CONTROL_OUTER_LOOPEXIT]] ]
; CHECK-NEXT: br label [[CONTROL_OUTER_OUTER]]
; CHECK: bb3:
; CHECK-NEXT: [[NEXTID17]] = add i32 [[SWITCHCOND_0]], -2
; CHECK-NEXT: br label [[CONTROL_OUTER]]
; CHECK: bb0:
; CHECK-NEXT: br label [[CONTROL]]
; CHECK: bb1.us-lcssa:
; CHECK-NEXT: br label [[BB1]]
; CHECK: bb1:
; CHECK-NEXT: ret i32 0
;
init:
br label %control.outer.outer
control.outer.loopexit.us-lcssa: ; preds = %control
br label %control.outer.loopexit
control.outer.loopexit: ; preds = %control.outer.loopexit.us-lcssa.us, %control.outer.loopexit.us-lcssa
br label %control.outer.outer.backedge
control.outer.outer: ; preds = %control.outer.outer.backedge, %init
%switchCond.0.ph.ph = phi i32 [ 2, %init ], [ 3, %control.outer.outer.backedge ] ; <i32> [#uses=2]
%i.0.ph.ph = phi i32 [ undef, %init ], [ %i.0.ph.ph.be, %control.outer.outer.backedge ] ; <i32> [#uses=1]
%tmp4 = icmp eq i32 %i.0.ph.ph, 0 ; <i1> [#uses=1]
br i1 %tmp4, label %control.outer.outer.split.us, label %control.outer.outer.control.outer.outer.split_crit_edge
control.outer.outer.control.outer.outer.split_crit_edge: ; preds = %control.outer.outer
br label %control.outer
control.outer.outer.split.us: ; preds = %control.outer.outer
br label %control.outer.us
control.outer.us: ; preds = %bb3.us, %control.outer.outer.split.us
%A.0.ph.us = phi i32 [ %switchCond.0.us, %bb3.us ], [ 4, %control.outer.outer.split.us ] ; <i32> [#uses=2]
%switchCond.0.ph.us = phi i32 [ %A.0.ph.us, %bb3.us ], [ %switchCond.0.ph.ph, %control.outer.outer.split.us ] ; <i32> [#uses=1]
br label %control.us
bb3.us: ; preds = %control.us
br label %control.outer.us
bb0.us: ; preds = %control.us
br label %control.us
control.us: ; preds = %bb0.us, %control.outer.us
%switchCond.0.us = phi i32 [ %A.0.ph.us, %bb0.us ], [ %switchCond.0.ph.us, %control.outer.us ] ; <i32> [#uses=2]
switch i32 %switchCond.0.us, label %control.outer.loopexit.us-lcssa.us [
i32 0, label %bb0.us
i32 1, label %bb1.us-lcssa.us
i32 3, label %bb3.us
i32 4, label %bb4.us-lcssa.us
]
control.outer.loopexit.us-lcssa.us: ; preds = %control.us
br label %control.outer.loopexit
bb1.us-lcssa.us: ; preds = %control.us
br label %bb1
bb4.us-lcssa.us: ; preds = %control.us
br label %bb4
control.outer: ; preds = %bb3, %control.outer.outer.control.outer.outer.split_crit_edge
%A.0.ph = phi i32 [ %nextId17, %bb3 ], [ 4, %control.outer.outer.control.outer.outer.split_crit_edge ] ; <i32> [#uses=1]
%switchCond.0.ph = phi i32 [ 0, %bb3 ], [ %switchCond.0.ph.ph, %control.outer.outer.control.outer.outer.split_crit_edge ] ; <i32> [#uses=1]
br label %control
control: ; preds = %bb0, %control.outer
%switchCond.0 = phi i32 [ %A.0.ph, %bb0 ], [ %switchCond.0.ph, %control.outer ] ; <i32> [#uses=2]
switch i32 %switchCond.0, label %control.outer.loopexit.us-lcssa [
i32 0, label %bb0
i32 1, label %bb1.us-lcssa
i32 3, label %bb3
i32 4, label %bb4.us-lcssa
]
bb4.us-lcssa: ; preds = %control
br label %bb4
bb4: ; preds = %bb4.us-lcssa, %bb4.us-lcssa.us
br label %control.outer.outer.backedge
control.outer.outer.backedge: ; preds = %bb4, %control.outer.loopexit
%i.0.ph.ph.be = phi i32 [ 1, %bb4 ], [ 0, %control.outer.loopexit ] ; <i32> [#uses=1]
br label %control.outer.outer
bb3: ; preds = %control
%nextId17 = add i32 %switchCond.0, -2 ; <i32> [#uses=1]
br label %control.outer
bb0: ; preds = %control
br label %control
bb1.us-lcssa: ; preds = %control
br label %bb1
bb1: ; preds = %bb1.us-lcssa, %bb1.us-lcssa.us
ret i32 0
}
; Make sure SCCP honors the xor "idiom"
; rdar://9956541
define i32 @test3() {
; CHECK-LABEL: @test3(
; CHECK-NEXT: [[T:%.*]] = xor i32 undef, undef
; CHECK-NEXT: ret i32 [[T]]
;
%t = xor i32 undef, undef
ret i32 %t
}
; Be conservative with FP ops
define double @test4(double %x) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: [[T:%.*]] = fadd double [[X:%.*]], undef
; CHECK-NEXT: ret double [[T]]
;
%t = fadd double %x, undef
ret double %t
}
; Make sure casts produce a possible value
define i32 @test5() {
; CHECK-LABEL: @test5(
; CHECK-NEXT: [[T:%.*]] = sext i8 undef to i32
; CHECK-NEXT: ret i32 [[T]]
;
%t = sext i8 undef to i32
ret i32 %t
}
; Make sure ashr produces a possible value
define i32 @test6() {
; CHECK-LABEL: @test6(
; CHECK-NEXT: [[T:%.*]] = ashr i32 undef, 31
; CHECK-NEXT: ret i32 [[T]]
;
%t = ashr i32 undef, 31
ret i32 %t
}
; Make sure lshr produces a possible value
define i32 @test7() {
; CHECK-LABEL: @test7(
; CHECK-NEXT: [[T:%.*]] = lshr i32 undef, 31
; CHECK-NEXT: ret i32 [[T]]
;
%t = lshr i32 undef, 31
ret i32 %t
}
; icmp eq with undef simplifies to undef
define i1 @test8() {
; CHECK-LABEL: @test8(
; CHECK-NEXT: [[T:%.*]] = icmp eq i32 undef, -1
; CHECK-NEXT: ret i1 [[T]]
;
%t = icmp eq i32 undef, -1
ret i1 %t
}
; Make sure we don't conclude that relational comparisons simplify to undef
define i1 @test9() {
; CHECK-LABEL: @test9(
; CHECK-NEXT: [[T:%.*]] = icmp ugt i32 undef, -1
; CHECK-NEXT: ret i1 [[T]]
;
%t = icmp ugt i32 undef, -1
ret i1 %t
}
; Make sure we handle extractvalue
define i64 @test10() {
; CHECK-LABEL: @test10(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[E:%.*]] = extractvalue { i64, i64 } undef, 1
; CHECK-NEXT: ret i64 [[E]]
;
entry:
%e = extractvalue { i64, i64 } undef, 1
ret i64 %e
}
@GV = common global i32 0, align 4
define i32 @test11(i1 %tobool) {
; CHECK-LABEL: @test11(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SHR4:%.*]] = ashr i32 undef, zext (i1 icmp eq (i32* bitcast (i32 (i1)* @test11 to i32*), i32* @GV) to i32)
; CHECK-NEXT: ret i32 [[SHR4]]
;
entry:
%shr4 = ashr i32 undef, zext (i1 icmp eq (i32* bitcast (i32 (i1)* @test11 to i32*), i32* @GV) to i32)
ret i32 %shr4
}
; Test unary ops
define double @test12(double %x) {
; CHECK-LABEL: @test12(
; CHECK-NEXT: [[T:%.*]] = fneg double undef
; CHECK-NEXT: ret double [[T]]
;
%t = fneg double undef
ret double %t
}
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