1; RUN: opt < %s -instcombine -S | FileCheck %s 2target datalayout = "E-p:64:64:64-p1:32:32:32-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" 3 4; Instcombine should be able to prove vector alignment in the 5; presence of a few mild address computation tricks. 6 7; CHECK-LABEL: @test0( 8; CHECK: align 16 9 10define void @test0(i8* %b, i64 %n, i64 %u, i64 %y) nounwind { 11entry: 12 %c = ptrtoint i8* %b to i64 13 %d = and i64 %c, -16 14 %e = inttoptr i64 %d to double* 15 %v = mul i64 %u, 2 16 %z = and i64 %y, -2 17 %t1421 = icmp eq i64 %n, 0 18 br i1 %t1421, label %return, label %bb 19 20bb: 21 %i = phi i64 [ %indvar.next, %bb ], [ 20, %entry ] 22 %j = mul i64 %i, %v 23 %h = add i64 %j, %z 24 %t8 = getelementptr double, double* %e, i64 %h 25 %p = bitcast double* %t8 to <2 x double>* 26 store <2 x double><double 0.0, double 0.0>, <2 x double>* %p, align 8 27 %indvar.next = add i64 %i, 1 28 %exitcond = icmp eq i64 %indvar.next, %n 29 br i1 %exitcond, label %return, label %bb 30 31return: 32 ret void 33} 34 35; When we see a unaligned load from an insufficiently aligned global or 36; alloca, increase the alignment of the load, turning it into an aligned load. 37 38; CHECK-LABEL: @test1( 39; CHECK: tmp = load 40; CHECK: GLOBAL{{.*}}align 16 41 42@GLOBAL = internal global [4 x i32] zeroinitializer 43 44define <16 x i8> @test1(<2 x i64> %x) { 45entry: 46 %tmp = load <16 x i8>, <16 x i8>* bitcast ([4 x i32]* @GLOBAL to <16 x i8>*), align 1 47 ret <16 x i8> %tmp 48} 49 50@GLOBAL_as1 = internal addrspace(1) global [4 x i32] zeroinitializer 51 52define <16 x i8> @test1_as1(<2 x i64> %x) { 53; CHECK-LABEL: @test1_as1( 54; CHECK: tmp = load 55; CHECK: GLOBAL_as1{{.*}}align 16 56 %tmp = load <16 x i8>, <16 x i8> addrspace(1)* bitcast ([4 x i32] addrspace(1)* @GLOBAL_as1 to <16 x i8> addrspace(1)*), align 1 57 ret <16 x i8> %tmp 58} 59 60@GLOBAL_as1_gep = internal addrspace(1) global [8 x i32] zeroinitializer 61 62define <16 x i8> @test1_as1_gep(<2 x i64> %x) { 63; CHECK-LABEL: @test1_as1_gep( 64; CHECK: tmp = load 65; CHECK: GLOBAL_as1_gep{{.*}}align 16 66 %tmp = load <16 x i8>, <16 x i8> addrspace(1)* bitcast (i32 addrspace(1)* getelementptr ([8 x i32], [8 x i32] addrspace(1)* @GLOBAL_as1_gep, i16 0, i16 4) to <16 x i8> addrspace(1)*), align 1 67 ret <16 x i8> %tmp 68} 69 70 71; When a load or store lacks an explicit alignment, add one. 72 73; CHECK-LABEL: @test2( 74; CHECK: load double, double* %p, align 8 75; CHECK: store double %n, double* %p, align 8 76 77define double @test2(double* %p, double %n) nounwind { 78 %t = load double, double* %p 79 store double %n, double* %p 80 ret double %t 81} 82 83declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind 84 85declare void @use(i8*) 86 87%struct.s = type { i32, i32, i32, i32 } 88 89define void @test3(%struct.s* sret %a4) { 90; Check that the alignment is bumped up the alignment of the sret type. 91; CHECK-LABEL: @test3( 92 %a4.cast = bitcast %struct.s* %a4 to i8* 93 call void @llvm.memset.p0i8.i64(i8* %a4.cast, i8 0, i64 16, i32 1, i1 false) 94; CHECK: call void @llvm.memset.p0i8.i64(i8* %a4.cast, i8 0, i64 16, i32 4, i1 false) 95 call void @use(i8* %a4.cast) 96 ret void 97} 98