; A store or load cannot alias a global if the accessed amount is larger then | |
; the global. | |
; RUN: opt < %s -basicaa -gvn -S | FileCheck %s | |
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128" | |
@B = global i16 8 | |
; CHECK: @test1 | |
define i16 @test1(i32* %P) { | |
%X = load i16* @B | |
store i32 7, i32* %P | |
%Y = load i16* @B | |
%Z = sub i16 %Y, %X | |
ret i16 %Z | |
; CHECK: ret i16 0 | |
} | |
; Cannot know anything about the size of this global. | |
; rdar://8813415 | |
@window = external global [0 x i8] | |
; CHECK: @test2 | |
define i8 @test2(i32 %tmp79, i32 %w.2, i32 %indvar89) nounwind { | |
%tmp92 = add i32 %tmp79, %indvar89 | |
%arrayidx412 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp92 | |
%tmp93 = add i32 %w.2, %indvar89 | |
%arrayidx416 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp93 | |
%A = load i8* %arrayidx412, align 1 | |
store i8 4, i8* %arrayidx416, align 1 | |
%B = load i8* %arrayidx412, align 1 | |
%C = sub i8 %A, %B | |
ret i8 %C | |
; CHECK: %B = load i8 | |
; CHECK: ret i8 %C | |
} | |