| ; 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 } |