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104 lines
4.0 KiB
104 lines
4.0 KiB
4 months ago
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; RUN: opt < %s -loop-unroll -S -unroll-count=4 | FileCheck %s
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; Test phi update after partial unroll.
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declare i1 @check() nounwind
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; CHECK: @test
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; CHECK: if.else:
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; CHECK: if.then.loopexit
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; CHECK: %sub5.lcssa = phi i32 [ %sub{{.*}}, %if.else{{.*}} ], [ %sub{{.*}}, %if.else{{.*}} ], [ %sub{{.*}}, %if.else{{.*}} ], [ %sub{{.*}}, %if.else{{.*}} ]
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; CHECK: if.else.3
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define void @test1(i32 %i, i32 %j) nounwind uwtable ssp {
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entry:
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%cond1 = call zeroext i1 @check()
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br i1 %cond1, label %if.then, label %if.else.lr.ph
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if.else.lr.ph: ; preds = %entry
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br label %if.else
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if.else: ; preds = %if.else, %if.else.lr.ph
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%sub = phi i32 [ %i, %if.else.lr.ph ], [ %sub5, %if.else ]
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%sub5 = sub i32 %sub, %j
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%cond2 = call zeroext i1 @check()
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br i1 %cond2, label %if.then, label %if.else
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if.then: ; preds = %if.else, %entry
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%i.tr = phi i32 [ %i, %entry ], [ %sub5, %if.else ]
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ret void
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}
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; PR7318: assertion failure after doing a simple loop unroll
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;
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; CHECK-LABEL: @test2(
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; CHECK: bb1.bb2_crit_edge:
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; CHECK: %.lcssa = phi i32 [ %{{[2468]}}, %bb1{{.*}} ], [ %{{[2468]}}, %bb1{{.*}} ], [ %{{[2468]}}, %bb1{{.*}} ], [ %{{[2468]}}, %bb1{{.*}} ]
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; CHECK: bb1.3:
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define i32 @test2(i32* nocapture %p, i32 %n) nounwind readonly {
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entry:
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%0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
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br i1 %0, label %bb.nph, label %bb2
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bb.nph: ; preds = %entry
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%tmp = zext i32 %n to i64 ; <i64> [#uses=1]
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br label %bb
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bb: ; preds = %bb.nph, %bb1
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%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %bb1 ] ; <i64> [#uses=2]
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%s.01 = phi i32 [ 0, %bb.nph ], [ %2, %bb1 ] ; <i32> [#uses=1]
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%scevgep = getelementptr i32, i32* %p, i64 %indvar ; <i32*> [#uses=1]
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%1 = load i32, i32* %scevgep, align 1 ; <i32> [#uses=1]
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%2 = add nsw i32 %1, %s.01 ; <i32> [#uses=2]
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br label %bb1
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bb1: ; preds = %bb
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%indvar.next = add i64 %indvar, 1 ; <i64> [#uses=2]
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%exitcond = icmp ne i64 %indvar.next, %tmp ; <i1> [#uses=1]
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br i1 %exitcond, label %bb, label %bb1.bb2_crit_edge
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bb1.bb2_crit_edge: ; preds = %bb1
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%.lcssa = phi i32 [ %2, %bb1 ] ; <i32> [#uses=1]
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br label %bb2
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bb2: ; preds = %bb1.bb2_crit_edge, %entry
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%s.0.lcssa = phi i32 [ %.lcssa, %bb1.bb2_crit_edge ], [ 0, %entry ] ; <i32> [#uses=1]
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ret i32 %s.0.lcssa
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}
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; Check phi update for loop with an early-exit.
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;
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; CHECK-LABEL: @test3(
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; CHECK: return.loopexit:
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; CHECK: %tmp7.i.lcssa = phi i32 [ %tmp7.i{{.*}}, %land.lhs.true{{.*}} ], [ %tmp7.i{{.*}}, %land.lhs.true{{.*}} ], [ %tmp7.i{{.*}}, %land.lhs.true{{.*}} ], [ %tmp7.i{{.*}}, %land.lhs.true{{.*}} ]
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; CHECK: exit.3:
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define i32 @test3() nounwind uwtable ssp align 2 {
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entry:
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%cond1 = call zeroext i1 @check()
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br i1 %cond1, label %return, label %if.end
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if.end: ; preds = %entry
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br label %do.body
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do.body: ; preds = %do.cond, %if.end
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%cond2 = call zeroext i1 @check()
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br i1 %cond2, label %exit, label %do.cond
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exit: ; preds = %do.body
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%tmp7.i = load i32, i32* undef, align 8
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br i1 undef, label %do.cond, label %land.lhs.true
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land.lhs.true: ; preds = %exit
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br i1 undef, label %return, label %do.cond
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do.cond: ; preds = %land.lhs.true, %exit, %do.body
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%cond3 = call zeroext i1 @check()
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br i1 %cond3, label %do.end, label %do.body
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do.end: ; preds = %do.cond
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br label %return
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return: ; preds = %do.end, %land.lhs.true, %entry
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%retval.0 = phi i32 [ 0, %do.end ], [ 0, %entry ], [ %tmp7.i, %land.lhs.true ]
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ret i32 %retval.0
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}
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