1344b65c90
This patch fixes a miscompile in LSR caused by incorrect inference of NUW flag for AddRec: we shouldn't infer no-wrap flags based on a comparison which doesn't fully control the loop exit.
66 lines
2.4 KiB
LLVM
66 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
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; RUN: opt < %s -loop-reduce -S | FileCheck %s
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; REQUIRES: x86-registered-target
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128-ni:1-p2:32:8:8:32-ni:2"
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target triple = "x86_64-unknown-linux-gnu"
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; The returned value should be equal to
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; zext (%phi-1) to i64
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; or simply 1209.
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define noundef i64 @test() {
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; CHECK-LABEL: define noundef i64 @test() {
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; CHECK-NEXT: bb2:
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; CHECK-NEXT: br label [[BB3:%.*]]
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; CHECK: bb3:
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; CHECK-NEXT: [[LSR_IV:%.*]] = phi i32 [ [[LSR_IV_NEXT:%.*]], [[BB10:%.*]] ], [ -1, [[BB2:%.*]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[LSR_IV]], 65536
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[TMP0]], 65535
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; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[AND]] to i64
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; CHECK-NEXT: [[ADD4:%.*]] = add nsw i64 [[ZEXT]], -128
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; CHECK-NEXT: [[ICMP5:%.*]] = icmp ult i64 [[ADD4]], -256
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; CHECK-NEXT: [[ICMP6:%.*]] = icmp ult i32 [[AND]], 128
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; CHECK-NEXT: [[OR:%.*]] = or i1 [[ICMP5]], [[ICMP6]]
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; CHECK-NEXT: br i1 [[OR]], label [[BB10]], label [[BB7:%.*]]
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; CHECK: bb7:
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; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[LSR_IV]], 1
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; CHECK-NEXT: call void @foo(i32 [[TMP1]])
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; CHECK-NEXT: unreachable
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; CHECK: bb10:
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; CHECK-NEXT: [[LSR_IV_NEXT]] = add nsw i32 [[LSR_IV]], 1
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; CHECK-NEXT: [[ICMP12:%.*]] = icmp ult i32 [[LSR_IV_NEXT]], 1210
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; CHECK-NEXT: br i1 [[ICMP12]], label [[BB3]], label [[BB13:%.*]]
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; CHECK: bb13:
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; CHECK-NEXT: ret i64 [[ZEXT]]
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;
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bb2:
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br label %bb3
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bb3: ; preds = %bb10, %bb2
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%phi = phi i32 [ 0, %bb2 ], [ %add11, %bb10 ]
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%add = add nuw nsw i32 %phi, 65535
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%and = and i32 %add, 65535
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%zext = zext i32 %and to i64
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%add4 = add nsw i64 %zext, -128
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%icmp5 = icmp ult i64 %add4, -256
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%icmp6 = icmp ult i32 %and, 128
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%or = or i1 %icmp5, %icmp6
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br i1 %or, label %bb10, label %bb7
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bb7: ; preds = %bb3
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call void @foo(i32 %phi)
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unreachable
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bb10: ; preds = %bb3
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%add11 = add nuw nsw i32 %phi, 1
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%icmp12 = icmp ult i32 %phi, 1210
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br i1 %icmp12, label %bb3, label %bb13
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bb13: ; preds = %bb10
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ret i64 %zext
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uselistorder i32 %phi, { 0, 3, 1, 2 }
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}
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declare void @foo(i32)
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