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unsigned-multiply-overflow-check.ll
133 lines (124 loc) · 6.76 KB
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unsigned-multiply-overflow-check.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s --check-prefix=SIMPLIFYCFG
; RUN: opt -instcombine -S < %s | FileCheck %s --check-prefix=INSTCOMBINEONLY
; RUN: opt -instcombine -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S < %s | FileCheck %s --check-prefix=INSTCOMBINESIMPLIFYCFGONLY
; RUN: opt -instcombine -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -instcombine -S < %s | FileCheck %s --check-prefix=INSTCOMBINESIMPLIFYCFGINSTCOMBINE
; RUN: opt -instcombine -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -phi-node-folding-threshold=3 -S < %s | FileCheck %s --check-prefix=INSTCOMBINESIMPLIFYCFGONLY
; RUN: opt -instcombine -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -instcombine -phi-node-folding-threshold=3 -S < %s | FileCheck %s --check-prefix=INSTCOMBINESIMPLIFYCFGINSTCOMBINE
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"
; #include <limits>
; #include <cstdint>
;
; using size_type = std::size_t;
; bool will_not_overflow(size_type size, size_type nmemb) {
; return (size != 0 && (nmemb > std::numeric_limits<size_type>::max() / size));
; }
define i1 @will_not_overflow(i64 %arg, i64 %arg1) {
; SIMPLIFYCFG-LABEL: @will_not_overflow(
; SIMPLIFYCFG-NEXT: bb:
; SIMPLIFYCFG-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
; SIMPLIFYCFG-NEXT: br i1 [[T0]], label [[BB5:%.*]], label [[BB2:%.*]]
; SIMPLIFYCFG: bb2:
; SIMPLIFYCFG-NEXT: [[T3:%.*]] = udiv i64 -1, [[ARG]]
; SIMPLIFYCFG-NEXT: [[T4:%.*]] = icmp ult i64 [[T3]], [[ARG1:%.*]]
; SIMPLIFYCFG-NEXT: br label [[BB5]]
; SIMPLIFYCFG: bb5:
; SIMPLIFYCFG-NEXT: [[T6:%.*]] = phi i1 [ false, [[BB:%.*]] ], [ [[T4]], [[BB2]] ]
; SIMPLIFYCFG-NEXT: ret i1 [[T6]]
;
; INSTCOMBINEONLY-LABEL: @will_not_overflow(
; INSTCOMBINEONLY-NEXT: bb:
; INSTCOMBINEONLY-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
; INSTCOMBINEONLY-NEXT: br i1 [[T0]], label [[BB5:%.*]], label [[BB2:%.*]]
; INSTCOMBINEONLY: bb2:
; INSTCOMBINEONLY-NEXT: [[UMUL:%.*]] = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 [[ARG]], i64 [[ARG1:%.*]])
; INSTCOMBINEONLY-NEXT: [[UMUL_OV:%.*]] = extractvalue { i64, i1 } [[UMUL]], 1
; INSTCOMBINEONLY-NEXT: br label [[BB5]]
; INSTCOMBINEONLY: bb5:
; INSTCOMBINEONLY-NEXT: [[T6:%.*]] = phi i1 [ false, [[BB:%.*]] ], [ [[UMUL_OV]], [[BB2]] ]
; INSTCOMBINEONLY-NEXT: ret i1 [[T6]]
;
; INSTCOMBINESIMPLIFYCFGONLY-LABEL: @will_not_overflow(
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: bb:
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[UMUL:%.*]] = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 [[ARG]], i64 [[ARG1:%.*]])
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[UMUL_OV:%.*]] = extractvalue { i64, i1 } [[UMUL]], 1
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[T6:%.*]] = select i1 [[T0]], i1 false, i1 [[UMUL_OV]]
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: ret i1 [[T6]]
;
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-LABEL: @will_not_overflow(
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: bb:
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: [[ARG1_FR:%.*]] = freeze i64 [[ARG1:%.*]]
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: [[UMUL:%.*]] = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 [[ARG:%.*]], i64 [[ARG1_FR]])
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: [[UMUL_OV:%.*]] = extractvalue { i64, i1 } [[UMUL]], 1
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: ret i1 [[UMUL_OV]]
;
bb:
%t0 = icmp eq i64 %arg, 0
br i1 %t0, label %bb5, label %bb2
bb2: ; preds = %bb
%t3 = udiv i64 -1, %arg
%t4 = icmp ult i64 %t3, %arg1
br label %bb5
bb5: ; preds = %bb2, %bb
%t6 = phi i1 [ false, %bb ], [ %t4, %bb2 ]
ret i1 %t6
}
; Same as @will_not_overflow, but inverting return value.
define i1 @will_overflow(i64 %arg, i64 %arg1) {
; SIMPLIFYCFG-LABEL: @will_overflow(
; SIMPLIFYCFG-NEXT: bb:
; SIMPLIFYCFG-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
; SIMPLIFYCFG-NEXT: br i1 [[T0]], label [[BB5:%.*]], label [[BB2:%.*]]
; SIMPLIFYCFG: bb2:
; SIMPLIFYCFG-NEXT: [[T3:%.*]] = udiv i64 -1, [[ARG]]
; SIMPLIFYCFG-NEXT: [[T4:%.*]] = icmp ult i64 [[T3]], [[ARG1:%.*]]
; SIMPLIFYCFG-NEXT: br label [[BB5]]
; SIMPLIFYCFG: bb5:
; SIMPLIFYCFG-NEXT: [[T6:%.*]] = phi i1 [ false, [[BB:%.*]] ], [ [[T4]], [[BB2]] ]
; SIMPLIFYCFG-NEXT: [[T7:%.*]] = xor i1 [[T6]], true
; SIMPLIFYCFG-NEXT: ret i1 [[T7]]
;
; INSTCOMBINEONLY-LABEL: @will_overflow(
; INSTCOMBINEONLY-NEXT: bb:
; INSTCOMBINEONLY-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
; INSTCOMBINEONLY-NEXT: br i1 [[T0]], label [[BB5:%.*]], label [[BB2:%.*]]
; INSTCOMBINEONLY: bb2:
; INSTCOMBINEONLY-NEXT: [[UMUL:%.*]] = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 [[ARG]], i64 [[ARG1:%.*]])
; INSTCOMBINEONLY-NEXT: [[UMUL_OV:%.*]] = extractvalue { i64, i1 } [[UMUL]], 1
; INSTCOMBINEONLY-NEXT: [[PHI_BO:%.*]] = xor i1 [[UMUL_OV]], true
; INSTCOMBINEONLY-NEXT: br label [[BB5]]
; INSTCOMBINEONLY: bb5:
; INSTCOMBINEONLY-NEXT: [[T6:%.*]] = phi i1 [ true, [[BB:%.*]] ], [ [[PHI_BO]], [[BB2]] ]
; INSTCOMBINEONLY-NEXT: ret i1 [[T6]]
;
; INSTCOMBINESIMPLIFYCFGONLY-LABEL: @will_overflow(
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: bb:
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[T0:%.*]] = icmp eq i64 [[ARG:%.*]], 0
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[UMUL:%.*]] = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 [[ARG]], i64 [[ARG1:%.*]])
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[UMUL_OV:%.*]] = extractvalue { i64, i1 } [[UMUL]], 1
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[PHI_BO:%.*]] = xor i1 [[UMUL_OV]], true
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: [[T6:%.*]] = select i1 [[T0]], i1 true, i1 [[PHI_BO]]
; INSTCOMBINESIMPLIFYCFGONLY-NEXT: ret i1 [[T6]]
;
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-LABEL: @will_overflow(
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: bb:
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: [[ARG1_FR:%.*]] = freeze i64 [[ARG1:%.*]]
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: [[UMUL:%.*]] = call { i64, i1 } @llvm.umul.with.overflow.i64(i64 [[ARG:%.*]], i64 [[ARG1_FR]])
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: [[UMUL_OV:%.*]] = extractvalue { i64, i1 } [[UMUL]], 1
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: [[PHI_BO:%.*]] = xor i1 [[UMUL_OV]], true
; INSTCOMBINESIMPLIFYCFGINSTCOMBINE-NEXT: ret i1 [[PHI_BO]]
;
bb:
%t0 = icmp eq i64 %arg, 0
br i1 %t0, label %bb5, label %bb2
bb2: ; preds = %bb
%t3 = udiv i64 -1, %arg
%t4 = icmp ult i64 %t3, %arg1
br label %bb5
bb5: ; preds = %bb2, %bb
%t6 = phi i1 [ false, %bb ], [ %t4, %bb2 ]
%t7 = xor i1 %t6, true
ret i1 %t7
}