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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -passes=indvars,guard-widening -S < %s | FileCheck %s3 4declare i32 @llvm.experimental.deoptimize.i32(...)5 6; Make sure that guard widening does not turn loop-invariant condition7; (that then gets optimized basing on this fact) into non-invariant.8; https://github.com/llvm/llvm-project/issues/60234 explains how it causes9; a miscompile.10define i32 @test(i32 %start) {11; CHECK-LABEL: @test(12; CHECK-NEXT: entry:13; CHECK-NEXT: [[WC1:%.*]] = call i1 @llvm.experimental.widenable.condition()14; CHECK-NEXT: br label [[LOOP:%.*]]15; CHECK: loop:16; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]17; CHECK-NEXT: br i1 [[WC1]], label [[GUARD_BLOCK:%.*]], label [[EXIT_BY_WC:%.*]]18; CHECK: exit_by_wc:19; CHECK-NEXT: [[IV_LCSSA:%.*]] = phi i32 [ [[START]], [[LOOP]] ]20; CHECK-NEXT: [[RVAL1:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV_LCSSA]]) ]21; CHECK-NEXT: ret i32 [[RVAL1]]22; CHECK: guard_block:23; CHECK-NEXT: [[START_PLUS_1:%.*]] = add i32 [[START]], 124; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[START_PLUS_1]], [[IV]]25; CHECK-NEXT: [[WC2:%.*]] = call i1 @llvm.experimental.widenable.condition()26; CHECK-NEXT: [[GUARD:%.*]] = and i1 [[COND]], [[WC2]]27; CHECK-NEXT: br i1 [[GUARD]], label [[BACKEDGE]], label [[FAILURE:%.*]]28; CHECK: backedge:29; CHECK-NEXT: call void @side_effect()30; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 131; CHECK-NEXT: br label [[LOOP]]32; CHECK: exit:33; CHECK-NEXT: ret i32 -134; CHECK: failure:35; CHECK-NEXT: [[IV_LCSSA1:%.*]] = phi i32 [ [[IV]], [[GUARD_BLOCK]] ]36; CHECK-NEXT: [[RVAL2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV_LCSSA1]]) ]37; CHECK-NEXT: ret i32 [[RVAL2]]38;39entry:40 %wc1 = call i1 @llvm.experimental.widenable.condition()41 br label %loop42 43loop:44 %iv = phi i32 [ %start, %entry ], [ %iv.next, %backedge ]45 br i1 %wc1, label %guard_block, label %exit_by_wc46 47exit_by_wc:48 %rval1 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]49 ret i32 %rval150 51guard_block:52 %start_plus_1 = add i32 %start, 153 %cond = icmp ne i32 %start_plus_1, %iv54 %wc2 = call i1 @llvm.experimental.widenable.condition()55 %guard = and i1 %cond, %wc256 br i1 %guard, label %backedge, label %failure57 58backedge:59 call void @side_effect()60 %iv.next = add i32 %iv, 161 br label %loop62 63exit:64 ret i32 -165 66failure:67 %rval2 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]68 ret i32 %rval269}70 71; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(inaccessiblemem: readwrite)72declare i1 @llvm.experimental.widenable.condition()73 74declare void @side_effect()75