| ; RUN: opt -basicaa -gvn -S < %s | FileCheck %s |
| |
| 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" |
| target triple = "x86_64-apple-macosx10.7.0" |
| |
| @x = common global i32 0, align 4 |
| @y = common global i32 0, align 4 |
| |
| ; GVN across unordered store (allowed) |
| define i32 @test1() nounwind uwtable ssp { |
| ; CHECK-LABEL: test1 |
| ; CHECK: add i32 %x, %x |
| entry: |
| %x = load i32, i32* @y |
| store atomic i32 %x, i32* @x unordered, align 4 |
| %y = load i32, i32* @y |
| %z = add i32 %x, %y |
| ret i32 %z |
| } |
| |
| ; GVN across unordered load (allowed) |
| define i32 @test3() nounwind uwtable ssp { |
| ; CHECK-LABEL: test3 |
| ; CHECK: add i32 %x, %x |
| entry: |
| %x = load i32, i32* @y |
| %y = load atomic i32, i32* @x unordered, align 4 |
| %z = load i32, i32* @y |
| %a = add i32 %x, %z |
| %b = add i32 %y, %a |
| ret i32 %b |
| } |
| |
| ; GVN load to unordered load (allowed) |
| define i32 @test5() nounwind uwtable ssp { |
| ; CHECK-LABEL: test5 |
| ; CHECK: add i32 %x, %x |
| entry: |
| %x = load atomic i32, i32* @x unordered, align 4 |
| %y = load i32, i32* @x |
| %z = add i32 %x, %y |
| ret i32 %z |
| } |
| |
| ; GVN unordered load to load (unordered load must not be removed) |
| define i32 @test6() nounwind uwtable ssp { |
| ; CHECK-LABEL: test6 |
| ; CHECK: load atomic i32, i32* @x unordered |
| entry: |
| %x = load i32, i32* @x |
| %x2 = load atomic i32, i32* @x unordered, align 4 |
| %x3 = add i32 %x, %x2 |
| ret i32 %x3 |
| } |
| |
| ; GVN across release-acquire pair (forbidden) |
| define i32 @test7() nounwind uwtable ssp { |
| ; CHECK-LABEL: test7 |
| ; CHECK: add i32 %x, %y |
| entry: |
| %x = load i32, i32* @y |
| store atomic i32 %x, i32* @x release, align 4 |
| %w = load atomic i32, i32* @x acquire, align 4 |
| %y = load i32, i32* @y |
| %z = add i32 %x, %y |
| ret i32 %z |
| } |
| |
| ; GVN across monotonic store (allowed) |
| define i32 @test9() nounwind uwtable ssp { |
| ; CHECK-LABEL: test9 |
| ; CHECK: add i32 %x, %x |
| entry: |
| %x = load i32, i32* @y |
| store atomic i32 %x, i32* @x monotonic, align 4 |
| %y = load i32, i32* @y |
| %z = add i32 %x, %y |
| ret i32 %z |
| } |
| |
| ; GVN of an unordered across monotonic load (not allowed) |
| define i32 @test10() nounwind uwtable ssp { |
| ; CHECK-LABEL: test10 |
| ; CHECK: add i32 %x, %y |
| entry: |
| %x = load atomic i32, i32* @y unordered, align 4 |
| %clobber = load atomic i32, i32* @x monotonic, align 4 |
| %y = load atomic i32, i32* @y monotonic, align 4 |
| %z = add i32 %x, %y |
| ret i32 %z |
| } |
| |
| define i32 @PR22708(i1 %flag) { |
| ; CHECK-LABEL: PR22708 |
| entry: |
| br i1 %flag, label %if.then, label %if.end |
| |
| if.then: |
| store i32 43, i32* @y, align 4 |
| ; CHECK: store i32 43, i32* @y, align 4 |
| br label %if.end |
| |
| if.end: |
| load atomic i32, i32* @x acquire, align 4 |
| %load = load i32, i32* @y, align 4 |
| ; CHECK: load atomic i32, i32* @x acquire, align 4 |
| ; CHECK: load i32, i32* @y, align 4 |
| ret i32 %load |
| } |