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