1 ; RUN: opt -basicaa -gvn -S < %s | FileCheck %s 2 3 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" 4 target triple = "x86_64-apple-macosx10.7.0" 5 6 @x = common global i32 0, align 4 7 @y = common global i32 0, align 4 8 9 ; GVN across unordered store (allowed) 10 define i32 @test1() nounwind uwtable ssp { 11 ; CHECK-LABEL: test1 12 ; CHECK: add i32 %x, %x 13 entry: 14 %x = load i32, i32* @y 15 store atomic i32 %x, i32* @x unordered, align 4 16 %y = load i32, i32* @y 17 %z = add i32 %x, %y 18 ret i32 %z 19 } 20 21 ; GVN across unordered load (allowed) 22 define i32 @test3() nounwind uwtable ssp { 23 ; CHECK-LABEL: test3 24 ; CHECK: add i32 %x, %x 25 entry: 26 %x = load i32, i32* @y 27 %y = load atomic i32, i32* @x unordered, align 4 28 %z = load i32, i32* @y 29 %a = add i32 %x, %z 30 %b = add i32 %y, %a 31 ret i32 %b 32 } 33 34 ; GVN load to unordered load (allowed) 35 define i32 @test5() nounwind uwtable ssp { 36 ; CHECK-LABEL: test5 37 ; CHECK: add i32 %x, %x 38 entry: 39 %x = load atomic i32, i32* @x unordered, align 4 40 %y = load i32, i32* @x 41 %z = add i32 %x, %y 42 ret i32 %z 43 } 44 45 ; GVN unordered load to load (unordered load must not be removed) 46 define i32 @test6() nounwind uwtable ssp { 47 ; CHECK-LABEL: test6 48 ; CHECK: load atomic i32, i32* @x unordered 49 entry: 50 %x = load i32, i32* @x 51 %x2 = load atomic i32, i32* @x unordered, align 4 52 %x3 = add i32 %x, %x2 53 ret i32 %x3 54 } 55 56 ; GVN across release-acquire pair (forbidden) 57 define i32 @test7() nounwind uwtable ssp { 58 ; CHECK-LABEL: test7 59 ; CHECK: add i32 %x, %y 60 entry: 61 %x = load i32, i32* @y 62 store atomic i32 %x, i32* @x release, align 4 63 %w = load atomic i32, i32* @x acquire, align 4 64 %y = load i32, i32* @y 65 %z = add i32 %x, %y 66 ret i32 %z 67 } 68 69 ; GVN across monotonic store (allowed) 70 define i32 @test9() nounwind uwtable ssp { 71 ; CHECK-LABEL: test9 72 ; CHECK: add i32 %x, %x 73 entry: 74 %x = load i32, i32* @y 75 store atomic i32 %x, i32* @x monotonic, align 4 76 %y = load i32, i32* @y 77 %z = add i32 %x, %y 78 ret i32 %z 79 } 80 81 ; GVN of an unordered across monotonic load (not allowed) 82 define i32 @test10() nounwind uwtable ssp { 83 ; CHECK-LABEL: test10 84 ; CHECK: add i32 %x, %y 85 entry: 86 %x = load atomic i32, i32* @y unordered, align 4 87 %clobber = load atomic i32, i32* @x monotonic, align 4 88 %y = load atomic i32, i32* @y monotonic, align 4 89 %z = add i32 %x, %y 90 ret i32 %z 91 } 92 93 define i32 @PR22708(i1 %flag) { 94 ; CHECK-LABEL: PR22708 95 entry: 96 br i1 %flag, label %if.then, label %if.end 97 98 if.then: 99 store i32 43, i32* @y, align 4 100 ; CHECK: store i32 43, i32* @y, align 4 101 br label %if.end 102 103 if.end: 104 load atomic i32, i32* @x acquire, align 4 105 %load = load i32, i32* @y, align 4 106 ; CHECK: load atomic i32, i32* @x acquire, align 4 107 ; CHECK: load i32, i32* @y, align 4 108 ret i32 %load 109 } 110
