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dcb42b6172
For the PHI node
%1 = phi [%A, %entry], [%X, %latch]
it is incorrect to use SCEV of backedge val %X as an exit value
of PHI unless %X is loop invariant.
This is because exit value of %1 is value of %X at one-before-last
iteration of the loop.
Reviewed By: Meinersbur
Differential Revision: https://reviews.llvm.org/D73181
68 lines
2.7 KiB
LLVM
68 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; NOTE: Only %local_3_4 is important here.
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; All other instructions are needed to lure LLVM into executing
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; specific code to trigger a bug.
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; RUN: opt < %s -indvars -S | FileCheck %s
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define i32 @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[OUTER:%.*]]
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; CHECK: outer:
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; CHECK-NEXT: [[LOCAL_6_6:%.*]] = phi i32 [ 10, [[ENTRY:%.*]] ], [ [[TMP5:%.*]], [[LATCH:%.*]] ]
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; CHECK-NEXT: [[LOCAL_4_5:%.*]] = phi i32 [ 56587, [[ENTRY]] ], [ 0, [[LATCH]] ]
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; CHECK-NEXT: [[LOCAL_3_4:%.*]] = phi i32 [ 2, [[ENTRY]] ], [ [[TMP5]], [[LATCH]] ]
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; CHECK-NEXT: [[DOTUDIV:%.*]] = udiv i32 [[LOCAL_6_6]], 8361
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; CHECK-NEXT: br label [[INNER:%.*]]
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; CHECK: inner:
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; CHECK-NEXT: [[LOCAL_7_3:%.*]] = phi i32 [ 2, [[OUTER]] ], [ [[TMP3:%.*]], [[INNER]] ]
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; CHECK-NEXT: [[LOCAL_4_5_PN:%.*]] = phi i32 [ [[LOCAL_4_5]], [[OUTER]] ], [ [[TMP2:%.*]], [[INNER]] ]
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; CHECK-NEXT: [[LOCAL_3_31:%.*]] = mul i32 [[LOCAL_4_5_PN]], [[DOTUDIV]]
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; CHECK-NEXT: [[TMP0:%.*]] = mul nuw nsw i32 [[LOCAL_7_3]], [[DOTUDIV]]
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; CHECK-NEXT: [[TMP1:%.*]] = sub i32 [[TMP0]], [[LOCAL_3_4]]
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; CHECK-NEXT: [[TMP2]] = add i32 [[TMP1]], [[LOCAL_3_31]]
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; CHECK-NEXT: [[TMP3]] = add nuw nsw i32 [[LOCAL_7_3]], 1
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; CHECK-NEXT: [[TMP4:%.*]] = icmp ugt i32 [[LOCAL_7_3]], 4
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; CHECK-NEXT: br i1 [[TMP4]], label [[LATCH]], label [[INNER]]
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; CHECK: latch:
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; CHECK-NEXT: [[DOTLCSSA:%.*]] = phi i32 [ [[TMP2]], [[INNER]] ]
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; CHECK-NEXT: [[TMP5]] = add nuw nsw i32 [[LOCAL_6_6]], 1
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; CHECK-NEXT: [[TMP6:%.*]] = icmp ugt i32 [[LOCAL_6_6]], 276
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; CHECK-NEXT: br i1 [[TMP6]], label [[RETURN:%.*]], label [[OUTER]]
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; CHECK: return:
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; CHECK-NEXT: [[DOTLCSSA_LCSSA:%.*]] = phi i32 [ [[DOTLCSSA]], [[LATCH]] ]
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; CHECK-NEXT: ret i32 [[DOTLCSSA_LCSSA]]
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;
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entry:
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br label %outer
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outer:
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%local_6_6 = phi i32 [ 10, %entry ], [ %5, %latch ]
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%local_4_5 = phi i32 [ 56587, %entry ], [ 0, %latch ]
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%local_3_4 = phi i32 [ 2, %entry ], [ %5, %latch ]
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%.udiv = udiv i32 %local_6_6, 8361
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br label %inner
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inner:
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%local_7_3 = phi i32 [ 2, %outer ], [ %3, %inner ]
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%local_4_5.pn = phi i32 [ %local_4_5, %outer ], [ %2, %inner ]
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%local_3_31 = mul i32 %local_4_5.pn, %.udiv
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%0 = mul i32 %local_7_3, %.udiv
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%1 = sub i32 %0, %local_3_4
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%2 = add i32 %1, %local_3_31
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%3 = add nuw nsw i32 %local_7_3, 1
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%4 = icmp ugt i32 %local_7_3, 4
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br i1 %4, label %latch, label %inner
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latch:
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%.lcssa = phi i32 [ %2, %inner ]
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%5 = add nuw nsw i32 %local_6_6, 1
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%6 = icmp ugt i32 %local_6_6, 276
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br i1 %6, label %return, label %outer
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return:
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%.lcssa.lcssa = phi i32 [ %.lcssa, %latch ]
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ret i32 %.lcssa.lcssa
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}
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