74 lines
2.8 KiB
LLVM
74 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=indvars,guard-widening -S < %s | FileCheck %s
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declare i32 @llvm.experimental.deoptimize.i32(...)
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; Make sure that guard widening does not turn loop-invariant condition
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; (that then gets optimized basing on this fact) into non-invariant.
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; https://github.com/llvm/llvm-project/issues/60234 explains how it causes
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; a miscompile.
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define i32 @test(i32 %start) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[WC1:%.*]] = call i1 @llvm.experimental.widenable.condition()
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
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; CHECK-NEXT: br i1 [[WC1]], label [[GUARD_BLOCK:%.*]], label [[EXIT_BY_WC:%.*]]
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; CHECK: exit_by_wc:
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; CHECK-NEXT: [[IV_LCSSA:%.*]] = phi i32 [ [[START]], [[LOOP]] ]
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; CHECK-NEXT: [[RVAL1:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV_LCSSA]]) ]
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; CHECK-NEXT: ret i32 [[RVAL1]]
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; CHECK: guard_block:
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; CHECK-NEXT: [[START_PLUS_1:%.*]] = add i32 [[START]], 1
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; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[START_PLUS_1]], [[IV]]
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; CHECK-NEXT: [[WC2:%.*]] = call i1 @llvm.experimental.widenable.condition()
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; CHECK-NEXT: [[GUARD:%.*]] = and i1 [[COND]], [[WC2]]
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; CHECK-NEXT: br i1 [[GUARD]], label [[BACKEDGE]], label [[FAILURE:%.*]]
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; CHECK: backedge:
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; CHECK-NEXT: call void @side_effect()
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
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; CHECK-NEXT: br label [[LOOP]]
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; CHECK: exit:
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; CHECK-NEXT: ret i32 -1
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; CHECK: failure:
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; CHECK-NEXT: [[IV_LCSSA1:%.*]] = phi i32 [ [[IV]], [[GUARD_BLOCK]] ]
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; CHECK-NEXT: [[RVAL2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV_LCSSA1]]) ]
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; CHECK-NEXT: ret i32 [[RVAL2]]
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;
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entry:
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%wc1 = call i1 @llvm.experimental.widenable.condition()
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br label %loop
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loop:
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%iv = phi i32 [ %start, %entry ], [ %iv.next, %backedge ]
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br i1 %wc1, label %guard_block, label %exit_by_wc
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exit_by_wc:
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%rval1 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]
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ret i32 %rval1
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guard_block:
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%start_plus_1 = add i32 %start, 1
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%cond = icmp ne i32 %start_plus_1, %iv
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%wc2 = call i1 @llvm.experimental.widenable.condition()
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%guard = and i1 %cond, %wc2
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br i1 %guard, label %backedge, label %failure
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backedge:
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call void @side_effect()
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%iv.next = add i32 %iv, 1
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br label %loop
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exit:
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ret i32 -1
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failure:
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%rval2 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]
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ret i32 %rval2
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}
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; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(inaccessiblemem: readwrite)
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declare i1 @llvm.experimental.widenable.condition()
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declare void @side_effect()
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