| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -simplifycfg -S | FileCheck %s |
| |
| ; In PR17073 ( http://llvm.org/pr17073 ), we illegally hoisted an operation that can trap. |
| ; The first test confirms that we don't do that when the trapping op is reached by the current BB (block1). |
| ; The second test confirms that we don't do that when the trapping op is reached by the previous BB (entry). |
| ; The third test confirms that we can still do this optimization for an operation (add) that doesn't trap. |
| ; The tests must be complicated enough to prevent previous SimplifyCFG actions from optimizing away |
| ; the instructions that we're checking for. |
| |
| target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128" |
| target triple = "i386-apple-macosx10.9.0" |
| |
| @a = common global i32 0, align 4 |
| @b = common global i8 0, align 1 |
| |
| define i32* @can_trap1() { |
| ; CHECK-LABEL: @can_trap1( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4 |
| ; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0 |
| ; CHECK-NEXT: br i1 [[TOBOOL]], label [[EXIT:%.*]], label [[BLOCK1:%.*]] |
| ; CHECK: block1: |
| ; CHECK-NEXT: br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label [[EXIT]], label [[BLOCK2:%.*]] |
| ; CHECK: block2: |
| ; CHECK-NEXT: br label [[EXIT]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32* [ null, [[ENTRY:%.*]] ], [ null, [[BLOCK2]] ], [ select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), [[BLOCK1]] ] |
| ; CHECK-NEXT: ret i32* [[STOREMERGE]] |
| ; |
| entry: |
| %0 = load i32, i32* @a, align 4 |
| %tobool = icmp eq i32 %0, 0 |
| br i1 %tobool, label %exit, label %block1 |
| |
| block1: |
| br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2 |
| |
| block2: |
| br label %exit |
| |
| exit: |
| %storemerge = phi i32* [ null, %entry ],[ null, %block2 ], [ select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %block1 ] |
| ret i32* %storemerge |
| } |
| |
| define i32* @can_trap2() { |
| ; CHECK-LABEL: @can_trap2( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4 |
| ; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0 |
| ; CHECK-NEXT: br i1 [[TOBOOL]], label [[EXIT:%.*]], label [[BLOCK1:%.*]] |
| ; CHECK: block1: |
| ; CHECK-NEXT: ret i32* null |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret i32* select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a) |
| ; |
| entry: |
| %0 = load i32, i32* @a, align 4 |
| %tobool = icmp eq i32 %0, 0 |
| br i1 %tobool, label %exit, label %block1 |
| |
| block1: |
| br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2 |
| |
| block2: |
| br label %exit |
| |
| exit: |
| %storemerge = phi i32* [ select (i1 icmp eq (i64 urem (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %entry ],[ null, %block2 ], [ null, %block1 ] |
| ret i32* %storemerge |
| } |
| |
| define i32* @cannot_trap() { |
| ; CHECK-LABEL: @cannot_trap( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* @a, align 4 |
| ; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0 |
| ; CHECK-NEXT: br i1 [[TOBOOL]], label [[EXIT:%.*]], label [[BLOCK1:%.*]] |
| ; CHECK: block1: |
| ; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), i32* select (i1 icmp eq (i64 add (i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64), i64 2), i64 0), i32* null, i32* @a), i32* null |
| ; CHECK-NEXT: ret i32* [[SPEC_SELECT]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret i32* null |
| ; |
| entry: |
| %0 = load i32, i32* @a, align 4 |
| %tobool = icmp eq i32 %0, 0 |
| br i1 %tobool, label %exit, label %block1 |
| |
| block1: |
| br i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a), label %exit, label %block2 |
| |
| block2: |
| br label %exit |
| |
| exit: |
| %storemerge = phi i32* [ null, %entry ],[ null, %block2 ], [ select (i1 icmp eq (i64 add (i64 2, i64 zext (i1 icmp eq (i32* bitcast (i8* @b to i32*), i32* @a) to i64)), i64 0), i32* null, i32* @a), %block1 ] |
| ret i32* %storemerge |
| } |