af49bed933
After replacing a loop phi with the preheader value, it's usually possible to simplify some of the using instructions, so do that as part of replaceLoopPHINodesWithPreheaderValues(). Doing this as part of IndVars is valuable, because it may make GEPs in the loop have constant offsets and allow the following SROA run to succeed (as demonstrated in the PhaseOrdering test). Differential Revision: https://reviews.llvm.org/D129293
66 lines
2.4 KiB
LLVM
66 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -indvars -S < %s | FileCheck %s
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@b = common global i32 0, align 4
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@c = common global i32 0, align 4
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@a = common global i32 0, align 4
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declare void @abort() #1
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; Function Attrs: nounwind ssp uwtable
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define i32 @main() {
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; CHECK-LABEL: @main(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR_COND1_PREHEADER:%.*]]
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; CHECK: for.cond1.preheader:
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; CHECK-NEXT: br label [[FOR_BODY3:%.*]]
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; CHECK: for.body3:
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; CHECK-NEXT: br i1 false, label [[FOR_BODY3]], label [[FOR_END:%.*]]
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; CHECK: for.end:
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; CHECK-NEXT: br i1 false, label [[FOR_COND1_PREHEADER]], label [[FOR_END6:%.*]]
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; CHECK: for.end6:
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; CHECK-NEXT: [[OR_LCSSA_LCSSA:%.*]] = phi i32 [ -1, [[FOR_END]] ]
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; CHECK-NEXT: store i32 [[OR_LCSSA_LCSSA]], i32* @a, align 4
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; CHECK-NEXT: [[CMP7:%.*]] = icmp eq i32 [[OR_LCSSA_LCSSA]], -1
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; CHECK-NEXT: br i1 [[CMP7]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: tail call void @abort()
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; CHECK-NEXT: unreachable
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; CHECK: if.end:
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; CHECK-NEXT: ret i32 0
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;
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entry:
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%a.promoted13 = load i32, i32* @a, align 4
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br label %for.cond1.preheader
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for.cond1.preheader: ; preds = %entry, %for.end
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%or.lcssa14 = phi i32 [ %a.promoted13, %entry ], [ %or.lcssa, %for.end ]
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%d.010 = phi i32 [ 1, %entry ], [ 0, %for.end ]
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br label %for.body3
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for.body3: ; preds = %for.cond1.preheader, %for.body3
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%inc12 = phi i32 [ 0, %for.cond1.preheader ], [ %inc, %for.body3 ]
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%or11 = phi i32 [ %or.lcssa14, %for.cond1.preheader ], [ %or, %for.body3 ]
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%add = sub i32 %inc12, %d.010
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%or = or i32 %or11, %add
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%inc = add i32 %inc12, 1
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br i1 false, label %for.body3, label %for.end
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for.end: ; preds = %for.body3
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%or.lcssa = phi i32 [ %or, %for.body3 ]
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br i1 false, label %for.cond1.preheader, label %for.end6
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for.end6: ; preds = %for.end
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%or.lcssa.lcssa = phi i32 [ %or.lcssa, %for.end ]
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store i32 %or.lcssa.lcssa, i32* @a, align 4
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%cmp7 = icmp eq i32 %or.lcssa.lcssa, -1
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br i1 %cmp7, label %if.end, label %if.then
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if.then: ; preds = %for.end6
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tail call void @abort() #2
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unreachable
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if.end: ; preds = %for.end6
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ret i32 0
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}
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