; RUN: llc -mtriple=aarch64 %s -o - | FileCheck %s ; RUN: llc -mtriple=aarch64 -global-isel=true -global-isel-abort=2 %s -o - | FileCheck %s ; Div whose result is unused should be removed unless we have strict exceptions ; CHECK-LABEL: unused_div: ; CHECK-NOT: fdiv ; CHECK: ret define void @unused_div(float %x, float %y) { entry: %add = fdiv float %x, %y ret void } ; CHECK-LABEL: unused_div_fpexcept_strict: ; CHECK: fdiv s0, s0, s1 ; CHECK-NEXT: ret define void @unused_div_fpexcept_strict(float %x, float %y) #0 { entry: %add = call float @llvm.experimental.constrained.fdiv.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0 ret void } ; CHECK-LABEL: unused_div_round_dynamic: ; CHECK-NOT: fdiv ; CHECK: ret define void @unused_div_round_dynamic(float %x, float %y) #0 { entry: %add = call float @llvm.experimental.constrained.fdiv.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0 ret void } ; Machine CSE should eliminate the second add unless we have strict exceptions ; CHECK-LABEL: add_twice: ; CHECK: fadd [[ADD:s[0-9]+]], s0, s1 ; CHECK-NEXT: cmp w0, #0 ; CHECK-NEXT: fmul [[MUL:s[0-9]+]], [[ADD]], [[ADD]] ; CHECK-NEXT: fcsel s0, [[ADD]], [[MUL]], eq ; CHECK-NEXT: ret define float @add_twice(float %x, float %y, i32 %n) { entry: %add = fadd float %x, %y %tobool.not = icmp eq i32 %n, 0 br i1 %tobool.not, label %if.end, label %if.then if.then: %add1 = fadd float %x, %y %mul = fmul float %add, %add1 br label %if.end if.end: %a.0 = phi float [ %mul, %if.then ], [ %add, %entry ] ret float %a.0 } ; CHECK-LABEL: add_twice_fpexcept_strict: ; CHECK: fmov [[X:s[0-9]+]], s0 ; CHECK-NEXT: fadd s0, s0, s1 ; CHECK-NEXT: cbz w0, [[LABEL:.LBB[0-9_]+]] ; CHECK: fadd [[ADD:s[0-9]+]], [[X]], s1 ; CHECK-NEXT: fmul s0, s0, [[ADD]] ; CHECK: [[LABEL]]: ; CHECK-NEXT: ret define float @add_twice_fpexcept_strict(float %x, float %y, i32 %n) #0 { entry: %add = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0 %tobool.not = icmp eq i32 %n, 0 br i1 %tobool.not, label %if.end, label %if.then if.then: %add1 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0 %mul = call float @llvm.experimental.constrained.fmul.f32(float %add, float %add1, metadata !"round.tonearest", metadata !"fpexcept.strict") #0 br label %if.end if.end: %a.0 = phi float [ %mul, %if.then ], [ %add, %entry ] ret float %a.0 } ; CHECK-LABEL: add_twice_round_dynamic: ; CHECK: fadd s0, s0, s1 ; CHECK-NEXT: cbz w0, [[LABEL:.LBB[0-9_]+]] ; CHECK-NOT: fadd ; CHECK: fmul s0, s0, s0 ; CHECK: [[LABEL]]: ; CHECK-NEXT: ret define float @add_twice_round_dynamic(float %x, float %y, i32 %n) #0 { entry: %add = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0 %tobool.not = icmp eq i32 %n, 0 br i1 %tobool.not, label %if.end, label %if.then if.then: %add1 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0 %mul = call float @llvm.experimental.constrained.fmul.f32(float %add, float %add1, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0 br label %if.end if.end: %a.0 = phi float [ %mul, %if.then ], [ %add, %entry ] ret float %a.0 } ; Two adds separated by llvm.set.rounding should be preserved when rounding is ; dynamic (as they may give different results) or when we have strict exceptions ; (the llvm.set.rounding is irrelevant, but both could trap). ; CHECK-LABEL: set_rounding: ; CHECK-DAG: fadd [[SREG:s[0-9]+]], s0, s1 ; CHECK-DAG: mrs [[XREG1:x[0-9]+]], FPCR ; CHECK-DAG: orr [[XREG2:x[0-9]+]], [[XREG1]], #0xc00000 ; CHECK: msr FPCR, [[XREG2]] ; CHECK-NEXT: mrs [[XREG3:x[0-9]+]], FPCR ; CHECK-NEXT: and [[XREG4:x[0-9]+]], [[XREG3]], #0xffffffffff3fffff ; CHECK-NEXT: msr FPCR, [[XREG4]] ; CHECK-NEXT: fsub s0, [[SREG]], [[SREG]] ; CHECK-NEXT: ret define float @set_rounding(float %x, float %y) { entry: %add1 = fadd float %x, %y call void @llvm.set.rounding(i32 0) %add2 = fadd float %x, %y call void @llvm.set.rounding(i32 1) %sub = fsub float %add1, %add2 ret float %sub } ; CHECK-LABEL: set_rounding_fpexcept_strict: ; CHECK-DAG: fadd [[SREG1:s[0-9]+]], s0, s1 ; CHECK-DAG: mrs [[XREG1:x[0-9]+]], FPCR ; CHECK-DAG: orr [[XREG2:x[0-9]+]], [[XREG1]], #0xc00000 ; CHECK: msr FPCR, [[XREG2]] ; CHECK-DAG: fadd [[SREG2:s[0-9]+]], s0, s1 ; CHECK-DAG: mrs [[XREG3:x[0-9]+]], FPCR ; CHECK-DAG: and [[XREG4:x[0-9]+]], [[XREG3]], #0xffffffffff3fffff ; CHECK-NEXT: msr FPCR, [[XREG4]] ; CHECK-NEXT: fsub s0, [[SREG1]], [[SREG2]] ; CHECK-NEXT: ret define float @set_rounding_fpexcept_strict(float %x, float %y) #0 { entry: %add1 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0 call void @llvm.set.rounding(i32 0) #0 %add2 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0 call void @llvm.set.rounding(i32 1) #0 %sub = call float @llvm.experimental.constrained.fsub.f32(float %add1, float %add2, metadata !"round.tonearest", metadata !"fpexcept.strict") #0 ret float %sub } ; CHECK-LABEL: set_rounding_round_dynamic: ; CHECK-DAG: fadd [[SREG1:s[0-9]+]], s0, s1 ; CHECK-DAG: mrs [[XREG1:x[0-9]+]], FPCR ; CHECK-DAG: orr [[XREG2:x[0-9]+]], [[XREG1]], #0xc00000 ; CHECK: msr FPCR, [[XREG2]] ; CHECK-DAG: fadd [[SREG2:s[0-9]+]], s0, s1 ; CHECK-DAG: mrs [[XREG3:x[0-9]+]], FPCR ; CHECK-DAG: and [[XREG4:x[0-9]+]], [[XREG3]], #0xffffffffff3fffff ; CHECK-NEXT: msr FPCR, [[XREG4]] ; CHECK-NEXT: fsub s0, [[SREG1]], [[SREG2]] ; CHECK-NEXT: ret define float @set_rounding_round_dynamic(float %x, float %y) #0 { entry: %add1 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0 call void @llvm.set.rounding(i32 0) #0 %add2 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0 call void @llvm.set.rounding(i32 1) #0 %sub = call float @llvm.experimental.constrained.fsub.f32(float %add1, float %add2, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0 ret float %sub } declare float @llvm.experimental.constrained.fadd.f32(float, float, metadata, metadata) declare float @llvm.experimental.constrained.fsub.f32(float, float, metadata, metadata) declare float @llvm.experimental.constrained.fmul.f32(float, float, metadata, metadata) declare float @llvm.experimental.constrained.fdiv.f32(float, float, metadata, metadata) declare i32 @llvm.get.rounding() declare void @llvm.set.rounding(i32) attributes #0 = { strictfp }