1 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" 2 3 ; RUN: opt < %s -instcombine -S | FileCheck %s 4 ; END. 5 6 declare void @use(...) 7 8 ; Zero byte allocas should be deleted. 9 ; CHECK: @test 10 ; CHECK-NOT: alloca 11 define void @test() { 12 %X = alloca [0 x i32] ; <[0 x i32]*> [#uses=1] 13 call void (...)* @use( [0 x i32]* %X ) 14 %Y = alloca i32, i32 0 ; <i32*> [#uses=1] 15 call void (...)* @use( i32* %Y ) 16 %Z = alloca { } ; <{ }*> [#uses=1] 17 call void (...)* @use( { }* %Z ) 18 ret void 19 } 20 21 ; Zero byte allocas should be deleted. 22 ; CHECK: @test2 23 ; CHECK-NOT: alloca 24 define void @test2() { 25 %A = alloca i32 ; <i32*> [#uses=1] 26 store i32 123, i32* %A 27 ret void 28 } 29 30 ; Zero byte allocas should be deleted. 31 ; CHECK: @test3 32 ; CHECK-NOT: alloca 33 define void @test3() { 34 %A = alloca { i32 } ; <{ i32 }*> [#uses=1] 35 %B = getelementptr { i32 }* %A, i32 0, i32 0 ; <i32*> [#uses=1] 36 store i32 123, i32* %B 37 ret void 38 } 39 40 ; CHECK: @test4 41 ; CHECK: = zext i32 %n to i64 42 ; CHECK: %A = alloca i32, i64 % 43 define i32* @test4(i32 %n) { 44 %A = alloca i32, i32 %n 45 ret i32* %A 46 } 47
