1; RUN: llc < %s -march=x86 -mattr=+sse2 | FileCheck %s 2; PR2656 3 4target 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" 5target triple = "i686-apple-darwin9.4.0" 6 %struct.anon = type <{ float, float }> 7@.str = internal constant [17 x i8] c"pt: %.0f, %.0f\0A\00\00" ; <[17 x i8]*> [#uses=1] 8 9; We can not fold either stack load into an 'xor' instruction because that 10; would change what should be a 4-byte load into a 16-byte load. 11; We can fold the 16-byte constant load into either 'xor' instruction, 12; but we do not. It has more than one use, so it gets loaded into a register. 13 14define void @foo(%struct.anon* byval %p) nounwind { 15; CHECK-LABEL: foo: 16; CHECK: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero 17; CHECK-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero 18; CHECK-NEXT: movaps {{.*#+}} xmm2 = [2147483648,2147483648,2147483648,2147483648] 19; CHECK-NEXT: xorps %xmm2, %xmm0 20; CHECK-NEXT: cvtss2sd %xmm0, %xmm0 21; CHECK-NEXT: xorps %xmm2, %xmm1 22entry: 23 %tmp = getelementptr %struct.anon, %struct.anon* %p, i32 0, i32 0 ; <float*> [#uses=1] 24 %tmp1 = load float, float* %tmp ; <float> [#uses=1] 25 %tmp2 = getelementptr %struct.anon, %struct.anon* %p, i32 0, i32 1 ; <float*> [#uses=1] 26 %tmp3 = load float, float* %tmp2 ; <float> [#uses=1] 27 %neg = fsub float -0.000000e+00, %tmp1 ; <float> [#uses=1] 28 %conv = fpext float %neg to double ; <double> [#uses=1] 29 %neg4 = fsub float -0.000000e+00, %tmp3 ; <float> [#uses=1] 30 %conv5 = fpext float %neg4 to double ; <double> [#uses=1] 31 %call = call i32 (...) @printf( i8* getelementptr ([17 x i8], [17 x i8]* @.str, i32 0, i32 0), double %conv, double %conv5 ) ; <i32> [#uses=0] 32 ret void 33} 34 35declare i32 @printf(...) 36 37; We can not fold the load from the stack into the 'and' instruction because 38; that changes an 8-byte load into a 16-byte load (illegal memory access). 39; We can fold the load of the constant because it is a 16-byte vector constant. 40 41define double @PR22371(double %x) { 42; CHECK-LABEL: PR22371: 43; CHECK: movsd 16(%esp), %xmm0 44; CHECK-NEXT: andpd LCPI1_0, %xmm0 45; CHECK-NEXT: movlpd %xmm0, (%esp) 46 %call = tail call double @fabs(double %x) #0 47 ret double %call 48} 49 50declare double @fabs(double) #0 51attributes #0 = { readnone } 52 53