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173 lines
5.5 KiB
LLVM
173 lines
5.5 KiB
LLVM
; RUN: opt %s -sccp -S | FileCheck %s
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; PR6940
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define double @test1() {
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%t = sitofp i32 undef to double
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ret double %t
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; CHECK: @test1
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; CHECK: ret double 0.0
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}
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; rdar://7832370
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; Check that lots of stuff doesn't get turned into undef.
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define i32 @test2() nounwind readnone ssp {
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; CHECK: @test2
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init:
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br label %control.outer.outer
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control.outer.loopexit.us-lcssa: ; preds = %control
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br label %control.outer.loopexit
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control.outer.loopexit: ; preds = %control.outer.loopexit.us-lcssa.us, %control.outer.loopexit.us-lcssa
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br label %control.outer.outer.backedge
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control.outer.outer: ; preds = %control.outer.outer.backedge, %init
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%switchCond.0.ph.ph = phi i32 [ 2, %init ], [ 3, %control.outer.outer.backedge ] ; <i32> [#uses=2]
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%i.0.ph.ph = phi i32 [ undef, %init ], [ %i.0.ph.ph.be, %control.outer.outer.backedge ] ; <i32> [#uses=1]
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%tmp4 = icmp eq i32 %i.0.ph.ph, 0 ; <i1> [#uses=1]
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br i1 %tmp4, label %control.outer.outer.split.us, label %control.outer.outer.control.outer.outer.split_crit_edge
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control.outer.outer.control.outer.outer.split_crit_edge: ; preds = %control.outer.outer
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br label %control.outer
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control.outer.outer.split.us: ; preds = %control.outer.outer
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br label %control.outer.us
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control.outer.us: ; preds = %bb3.us, %control.outer.outer.split.us
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%A.0.ph.us = phi i32 [ %switchCond.0.us, %bb3.us ], [ 4, %control.outer.outer.split.us ] ; <i32> [#uses=2]
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%switchCond.0.ph.us = phi i32 [ %A.0.ph.us, %bb3.us ], [ %switchCond.0.ph.ph, %control.outer.outer.split.us ] ; <i32> [#uses=1]
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br label %control.us
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bb3.us: ; preds = %control.us
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br label %control.outer.us
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bb0.us: ; preds = %control.us
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br label %control.us
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; CHECK: control.us: ; preds = %bb0.us, %control.outer.us
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; CHECK-NEXT: %switchCond.0.us = phi i32
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; CHECK-NEXT: switch i32 %switchCond.0.us
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control.us: ; preds = %bb0.us, %control.outer.us
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%switchCond.0.us = phi i32 [ %A.0.ph.us, %bb0.us ], [ %switchCond.0.ph.us, %control.outer.us ] ; <i32> [#uses=2]
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switch i32 %switchCond.0.us, label %control.outer.loopexit.us-lcssa.us [
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i32 0, label %bb0.us
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i32 1, label %bb1.us-lcssa.us
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i32 3, label %bb3.us
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i32 4, label %bb4.us-lcssa.us
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]
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control.outer.loopexit.us-lcssa.us: ; preds = %control.us
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br label %control.outer.loopexit
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bb1.us-lcssa.us: ; preds = %control.us
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br label %bb1
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bb4.us-lcssa.us: ; preds = %control.us
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br label %bb4
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control.outer: ; preds = %bb3, %control.outer.outer.control.outer.outer.split_crit_edge
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%A.0.ph = phi i32 [ %nextId17, %bb3 ], [ 4, %control.outer.outer.control.outer.outer.split_crit_edge ] ; <i32> [#uses=1]
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%switchCond.0.ph = phi i32 [ 0, %bb3 ], [ %switchCond.0.ph.ph, %control.outer.outer.control.outer.outer.split_crit_edge ] ; <i32> [#uses=1]
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br label %control
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control: ; preds = %bb0, %control.outer
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%switchCond.0 = phi i32 [ %A.0.ph, %bb0 ], [ %switchCond.0.ph, %control.outer ] ; <i32> [#uses=2]
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switch i32 %switchCond.0, label %control.outer.loopexit.us-lcssa [
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i32 0, label %bb0
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i32 1, label %bb1.us-lcssa
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i32 3, label %bb3
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i32 4, label %bb4.us-lcssa
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]
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bb4.us-lcssa: ; preds = %control
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br label %bb4
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bb4: ; preds = %bb4.us-lcssa, %bb4.us-lcssa.us
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br label %control.outer.outer.backedge
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control.outer.outer.backedge: ; preds = %bb4, %control.outer.loopexit
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%i.0.ph.ph.be = phi i32 [ 1, %bb4 ], [ 0, %control.outer.loopexit ] ; <i32> [#uses=1]
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br label %control.outer.outer
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bb3: ; preds = %control
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%nextId17 = add i32 %switchCond.0, -2 ; <i32> [#uses=1]
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br label %control.outer
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bb0: ; preds = %control
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br label %control
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bb1.us-lcssa: ; preds = %control
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br label %bb1
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bb1: ; preds = %bb1.us-lcssa, %bb1.us-lcssa.us
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ret i32 0
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}
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; Make sure SCCP honors the xor "idiom"
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; rdar://9956541
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define i32 @test3() {
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%t = xor i32 undef, undef
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ret i32 %t
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; CHECK: @test3
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; CHECK: ret i32 0
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}
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; Be conservative with FP ops
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define double @test4(double %x) {
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%t = fadd double %x, undef
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ret double %t
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; CHECK: @test4
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; CHECK: fadd double %x, undef
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}
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; Make sure casts produce a possible value
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define i32 @test5() {
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%t = sext i8 undef to i32
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ret i32 %t
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; CHECK: @test5
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; CHECK: ret i32 0
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}
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; Make sure ashr produces a possible value
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define i32 @test6() {
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%t = ashr i32 undef, 31
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ret i32 %t
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; CHECK: @test6
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; CHECK: ret i32 -1
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}
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; Make sure lshr produces a possible value
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define i32 @test7() {
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%t = lshr i32 undef, 31
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ret i32 %t
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; CHECK: @test7
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; CHECK: ret i32 0
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}
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; icmp eq with undef simplifies to undef
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define i1 @test8() {
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%t = icmp eq i32 undef, -1
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ret i1 %t
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; CHECK: @test8
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; CHECK: ret i1 undef
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}
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; Make sure we don't conclude that relational comparisons simplify to undef
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define i1 @test9() {
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%t = icmp ugt i32 undef, -1
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ret i1 %t
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; CHECK: @test9
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; CHECK: icmp ugt
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}
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; Make sure we handle extractvalue
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define i64 @test10() {
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entry:
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%e = extractvalue { i64, i64 } undef, 1
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ret i64 %e
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; CHECK: @test10
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; CHECK: ret i64 undef
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}
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