87fdcb8749
This way it will be more obvious that the problem is both in cost threshold and in hardcoded benefit check, plus will show how the instsimplify cleans this all in the end. llvm-svn: 366800
89 lines
3.7 KiB
LLVM
89 lines
3.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -simplifycfg -S < %s | FileCheck %s --check-prefixes=ALL,SIMPLIFYCFG
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; RUN: opt -instcombine -S < %s | FileCheck %s --check-prefixes=ALL,INSTCOMBINE,INSTCOMBINEONLY
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; RUN: opt -instcombine -simplifycfg -S < %s | FileCheck %s --check-prefixes=ALL,INSTCOMBINE,INSTCOMBINESIMPLIFYCFG,INSTCOMBINESIMPLIFYCFGDEFAULT,INSTCOMBINESIMPLIFYCFGONLY
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; RUN: opt -instcombine -simplifycfg -instcombine -S < %s | FileCheck %s --check-prefixes=ALL,INSTCOMBINE,INSTCOMBINESIMPLIFYCFG,INSTCOMBINESIMPLIFYCFGDEFAULT,INSTCOMBINESIMPLIFYCFGINSTCOMBINE
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; RUN: opt -instcombine -simplifycfg -phi-node-folding-threshold=3 -S < %s | FileCheck %s --check-prefixes=ALL,INSTCOMBINE,INSTCOMBINESIMPLIFYCFG,INSTCOMBINESIMPLIFYCFGCOSTLY,INSTCOMBINESIMPLIFYCFGCOSTLYONLY
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; RUN: opt -instcombine -simplifycfg -instcombine -phi-node-folding-threshold=3 -S < %s | FileCheck %s --check-prefixes=ALL,INSTCOMBINE,INSTCOMBINESIMPLIFYCFG,INSTCOMBINESIMPLIFYCFGCOSTLY,INSTCOMBINESIMPLIFYCFGCOSTLYINSTCOMBINE
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-linux-gnu"
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; #include <limits>
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; #include <cstdint>
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;
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; using size_type = std::size_t;
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; bool will_not_overflow(size_type size, size_type nmemb) {
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; return (size != 0 && (nmemb > std::numeric_limits<size_type>::max() / size));
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; }
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define i1 @will_not_overflow(i64 %arg, i64 %arg1) {
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; ALL-LABEL: @will_not_overflow(
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; ALL-NEXT: bb:
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; ALL-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
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; ALL-NEXT: br i1 [[T0]], label [[BB5:%.*]], label [[BB2:%.*]]
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; ALL: bb2:
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; ALL-NEXT: [[T3:%.*]] = udiv i64 -1, [[ARG]]
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; ALL-NEXT: [[T4:%.*]] = icmp ult i64 [[T3]], [[ARG1:%.*]]
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; ALL-NEXT: br label [[BB5]]
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; ALL: bb5:
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; ALL-NEXT: [[T6:%.*]] = phi i1 [ false, [[BB:%.*]] ], [ [[T4]], [[BB2]] ]
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; ALL-NEXT: ret i1 [[T6]]
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;
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bb:
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%t0 = icmp eq i64 %arg, 0
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br i1 %t0, label %bb5, label %bb2
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bb2: ; preds = %bb
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%t3 = udiv i64 -1, %arg
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%t4 = icmp ult i64 %t3, %arg1
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br label %bb5
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bb5: ; preds = %bb2, %bb
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%t6 = phi i1 [ false, %bb ], [ %t4, %bb2 ]
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ret i1 %t6
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}
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; Same as @will_not_overflow, but inverting return value.
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define i1 @will_overflow(i64 %arg, i64 %arg1) {
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; SIMPLIFYCFG-LABEL: @will_overflow(
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; SIMPLIFYCFG-NEXT: bb:
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; SIMPLIFYCFG-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
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; SIMPLIFYCFG-NEXT: br i1 [[T0]], label [[BB5:%.*]], label [[BB2:%.*]]
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; SIMPLIFYCFG: bb2:
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; SIMPLIFYCFG-NEXT: [[T3:%.*]] = udiv i64 -1, [[ARG]]
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; SIMPLIFYCFG-NEXT: [[T4:%.*]] = icmp ult i64 [[T3]], [[ARG1:%.*]]
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; SIMPLIFYCFG-NEXT: br label [[BB5]]
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; SIMPLIFYCFG: bb5:
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; SIMPLIFYCFG-NEXT: [[T6:%.*]] = phi i1 [ false, [[BB:%.*]] ], [ [[T4]], [[BB2]] ]
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; SIMPLIFYCFG-NEXT: [[T7:%.*]] = xor i1 [[T6]], true
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; SIMPLIFYCFG-NEXT: ret i1 [[T7]]
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;
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; INSTCOMBINE-LABEL: @will_overflow(
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; INSTCOMBINE-NEXT: bb:
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; INSTCOMBINE-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
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; INSTCOMBINE-NEXT: br i1 [[T0]], label [[BB5:%.*]], label [[BB2:%.*]]
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; INSTCOMBINE: bb2:
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; INSTCOMBINE-NEXT: [[T3:%.*]] = udiv i64 -1, [[ARG]]
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; INSTCOMBINE-NEXT: [[T4:%.*]] = icmp uge i64 [[T3]], [[ARG1:%.*]]
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; INSTCOMBINE-NEXT: br label [[BB5]]
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; INSTCOMBINE: bb5:
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; INSTCOMBINE-NEXT: [[T6:%.*]] = phi i1 [ true, [[BB:%.*]] ], [ [[T4]], [[BB2]] ]
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; INSTCOMBINE-NEXT: ret i1 [[T6]]
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;
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bb:
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%t0 = icmp eq i64 %arg, 0
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br i1 %t0, label %bb5, label %bb2
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bb2: ; preds = %bb
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%t3 = udiv i64 -1, %arg
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%t4 = icmp ult i64 %t3, %arg1
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br label %bb5
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bb5: ; preds = %bb2, %bb
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%t6 = phi i1 [ false, %bb ], [ %t4, %bb2 ]
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%t7 = xor i1 %t6, true
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ret i1 %t7
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}
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