1; RUN: llc < %s -relocation-model=static -mcpu=yonah | FileCheck %s 2 3; The double argument is at 4(esp) which is 16-byte aligned, but we 4; are required to read in extra bytes of memory in order to fold the 5; load. Bad Things may happen when reading/processing undefined bytes, 6; so don't fold the load. 7; PR22371 / http://reviews.llvm.org/D7474 8 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 double 12 13define void @test({ double, double }* byval %z, double* %P) nounwind { 14entry: 15 %tmp3 = load double, double* @G, align 16 ; <double> [#uses=1] 16 %tmp4 = tail call double @fabs( double %tmp3 ) readnone ; <double> [#uses=1] 17 store volatile double %tmp4, double* %P 18 %tmp = getelementptr { double, double }, { double, double }* %z, i32 0, i32 0 ; <double*> [#uses=1] 19 %tmp1 = load volatile double, double* %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, double* %P, align 8 23 ret void 24 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{{.*}}$-16, %esp 38 ret void 39} 40 41; Use a call to force a spill. 42define <2 x double> @test3(<2 x double> %x, <2 x double> %y) alignstack(32) nounwind { 43entry: 44; CHECK-LABEL: test3: 45; CHECK: andl{{.*}}$-32, %esp 46 call void @test2() 47 %A = fmul <2 x double> %x, %y 48 ret <2 x double> %A 49} 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 16 57 %0 = ptrtoint [2048 x i8]* %buffer to i32 58 %and = and i32 %0, -16 59 ret i32 %and 60; CHECK-LABEL: test4: 61; CHECK-NOT: and 62; CHECK: ret 63} 64 65%struct.sixteen = type { [16 x i8] } 66 67; Accessing stack parameters shouldn't assume stack alignment. Here we should 68; emit two 8-byte loads, followed by two 8-byte stores. 69define x86_stdcallcc void @test5(%struct.sixteen* byval nocapture readonly align 4 %s) #0 { 70 %d.sroa.0 = alloca [16 x i8], align 1 71 %1 = getelementptr inbounds [16 x i8], [16 x i8]* %d.sroa.0, i32 0, i32 0 72 call void @llvm.lifetime.start.p0i8(i64 16, i8* %1) 73 %2 = getelementptr inbounds %struct.sixteen, %struct.sixteen* %s, i32 0, i32 0, i32 0 74 call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* %2, i32 16, i1 true) 75 call void @llvm.lifetime.end.p0i8(i64 16, i8* %1) 76 ret void 77; CHECK-LABEL: test5: 78; CHECK: and 79; CHECK: movsd 80; CHECK-NEXT: movsd 81; CHECK-NEXT: movsd 82; CHECK-NEXT: movsd 83} 84 85declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) argmemonly nounwind 86 87declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture readonly, i32, i1) argmemonly nounwind 88 89declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) argmemonly nounwind 90 91attributes #0 = { nounwind alignstack=16 "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" } 92