1; RUN: sed -e 's/SLHATTR/speculative_load_hardening/' %s | llc -verify-machineinstrs -mtriple=aarch64-none-linux-gnu 2>&1 | FileCheck %s --check-prefixes=CHECK,SLH 2; RUN: sed -e 's/SLHATTR//' %s | llc -verify-machineinstrs -mtriple=aarch64-none-linux-gnu 2>&1 | FileCheck %s --check-prefixes=CHECK,NOSLH 3 4; As SLH is falling back to a technique that doesn't use X16, we shouldn't see any warnings about clobbers. 5; (this would come from f_clobbered_reg_w16, but warnings are first in the output) 6; CHECK-NOT: warning: inline asm clobber list contains reserved registers: W16 7; CHECK-NOT: warning: inline asm clobber list contains reserved registers: X16 8 9declare i64 @g(i64, i64) local_unnamed_addr 10define i64 @f_using_reserved_reg_x16(i64 %a, i64 %b) local_unnamed_addr SLHATTR { 11; CHECK-LABEL: f_using_reserved_reg_x16 12; SLH: dsb sy 13; SLH: isb 14; NOSLH-NOT: dsb sy 15; NOSLH-NOT: isb 16entry: 17 %cmp = icmp ugt i64 %a, %b 18 br i1 %cmp, label %if.then, label %cleanup 19 20; CHECK: b.ls 21; SLH: dsb sy 22; SLH: isb 23; NOSLH-NOT: dsb sy 24; NOSLH-NOT: isb 25if.then: 26 %0 = tail call i64 asm "hint #12", "={x17},{x16},0"(i64 %b, i64 %a) 27; CHECK: bl g 28; SLH: dsb sy 29; SLH: isb 30; NOSLH-NOT: dsb sy 31; NOSLH-NOT: isb 32; CHECK: ret 33 %call = tail call i64 @g(i64 %a, i64 %b) #3 34 %add = add i64 %call, %0 35 br label %cleanup 36 37cleanup: 38; SLH: dsb sy 39; SLH: isb 40; NOSLH-NOT: dsb sy 41; NOSLH-NOT: isb 42; SLH: ret 43 %retval.0 = phi i64 [ %add, %if.then ], [ %b, %entry ] 44 ret i64 %retval.0 45} 46 47define i32 @f_clobbered_reg_w16(i32 %a, i32 %b) local_unnamed_addr SLHATTR { 48; CHECK-LABEL: f_clobbered_reg_w16 49entry: 50; SLH: dsb sy 51; SLH: isb 52; NOSLH-NOT: dsb sy 53; NOSLH-NOT: isb 54 %cmp = icmp sgt i32 %a, %b 55 br i1 %cmp, label %if.then, label %if.end 56; CHECK: b.le 57 58if.then: 59; SLH: dsb sy 60; SLH: isb 61; NOSLH-NOT: dsb sy 62; NOSLH-NOT: isb 63; CHECK: mov w16, w0 64 tail call void asm sideeffect "mov w16, ${0:w}", "r,~{w16}"(i32 %a) 65 br label %if.end 66; SLH: ret 67 68if.end: 69 %add = add nsw i32 %b, %a 70 ret i32 %add 71; SLH: dsb sy 72; SLH: isb 73; NOSLH-NOT: dsb sy 74; NOSLH-NOT: isb 75; SLH: ret 76} 77