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1; RUN: llc < %s -relocation-model=static -mcpu=yonah | FileCheck %s2 3; The double argument is at 4(esp) which is 16-byte aligned, but we4; are required to read in extra bytes of memory in order to fold the5; load. Bad Things may happen when reading/processing undefined bytes,6; so don't fold the load.7; PR22371 / http://reviews.llvm.org/D74748 9target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"10target triple = "i686-apple-darwin8"11@G = external global double12 13define void @test(ptr byval({ double, double }) %z, ptr %P) nounwind {14entry:15 %tmp3 = load double, ptr @G, align 16 ; <double> [#uses=1]16 %tmp4 = tail call double @fabs( double %tmp3 ) readnone ; <double> [#uses=1]17 store volatile double %tmp4, ptr %P18 %tmp = getelementptr { double, double }, ptr %z, i32 0, i32 0 ; <ptr> [#uses=1]19 %tmp1 = load volatile double, ptr %tmp, align 8 ; <double> [#uses=1]20 %tmp2 = tail call double @fabs( double %tmp1 ) readnone ; <double> [#uses=1]21 %tmp6 = fadd double %tmp4, %tmp2 ; <double> [#uses=1]22 store volatile double %tmp6, ptr %P, align 823 ret void24 25; CHECK-LABEL: test:26; CHECK: movsd {{.*}}G, %xmm{{.*}}27; CHECK: andpd %xmm{{.*}}, %xmm{{.*}}28; CHECK: movsd 4(%esp), %xmm{{.*}}29; CHECK: andpd %xmm{{.*}}, %xmm{{.*}}30 31 32}33 34define void @test2() alignstack(16) nounwind {35entry:36; CHECK-LABEL: test2:37; CHECK: andl{{.*}}$-16, %esp38 ret void39}40 41; Use a call to force a spill.42define <2 x double> @test3(<2 x double> %x, <2 x double> %y) alignstack(32) nounwind {43entry:44; CHECK-LABEL: test3:45; CHECK: andl{{.*}}$-32, %esp46 call void @test2()47 %A = fmul <2 x double> %x, %y48 ret <2 x double> %A49}50 51declare double @fabs(double)52 53; The pointer is already known aligned, so and x,-16 is eliminable.54define i32 @test4() nounwind {55entry:56 %buffer = alloca [2048 x i8], align 1657 %0 = ptrtoint ptr %buffer to i3258 %and = and i32 %0, -1659 ret i32 %and60; CHECK-LABEL: test4:61; CHECK-NOT: and62; CHECK: ret63}64 65%struct.sixteen = type { [16 x i8] }66 67; Accessing stack parameters shouldn't assume stack alignment. Here we should68; emit two 8-byte loads, followed by two 8-byte stores.69define x86_stdcallcc void @test5(ptr byval(%struct.sixteen) nocapture readonly align 4 %s) #0 {70 %d.sroa.0 = alloca [16 x i8], align 171 call void @llvm.lifetime.start.p0(i64 16, ptr %d.sroa.0)72 call void @llvm.memcpy.p0.p0.i32(ptr %d.sroa.0, ptr %s, i32 16, i1 true)73 call void @llvm.lifetime.end.p0(i64 16, ptr %d.sroa.0)74 ret void75; CHECK-LABEL: test5:76; CHECK: and77; CHECK: movsd78; CHECK-NEXT: movsd79; CHECK-NEXT: movsd80; CHECK-NEXT: movsd81}82 83declare void @llvm.lifetime.start.p0(i64, ptr nocapture) argmemonly nounwind84 85declare void @llvm.memcpy.p0.p0.i32(ptr nocapture, ptr nocapture readonly, i32, i1) argmemonly nounwind86 87declare void @llvm.lifetime.end.p0(i64, ptr nocapture) argmemonly nounwind88 89attributes #0 = { nounwind alignstack=16 "frame-pointer"="all" }90