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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
; RUN: llc -mtriple armv7-- -mattr=+vfp4 %s -o - | FileCheck %s
; Div whose result is unused should be removed unless we have strict exceptions
define void @unused_div(float %x, float %y) {
; CHECK-LABEL: unused_div:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: bx lr
entry:
%add = fdiv float %x, %y
ret void
}
define void @unused_div_fpexcept_strict(float %x, float %y) #0 {
; CHECK-LABEL: unused_div_fpexcept_strict:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: vmov s0, r1
; CHECK-NEXT: vmov s2, r0
; CHECK-NEXT: vdiv.f32 s0, s2, s0
; CHECK-NEXT: bx lr
entry:
%add = call float @llvm.experimental.constrained.fdiv.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
ret void
}
define void @unused_div_round_dynamic(float %x, float %y) #0 {
; CHECK-LABEL: unused_div_round_dynamic:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: bx lr
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
define float @add_twice(float %x, float %y, i32 %n) {
; CHECK-LABEL: add_twice:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: vmov s0, r1
; CHECK-NEXT: cmp r2, #0
; CHECK-NEXT: vmov s2, r0
; CHECK-NEXT: vadd.f32 s0, s2, s0
; CHECK-NEXT: vmul.f32 s2, s0, s0
; CHECK-NEXT: vmoveq.f32 s2, s0
; CHECK-NEXT: vmov r0, s2
; CHECK-NEXT: bx lr
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
}
define float @add_twice_fpexcept_strict(float %x, float %y, i32 %n) #0 {
; CHECK-LABEL: add_twice_fpexcept_strict:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: vmov s2, r1
; CHECK-NEXT: cmp r2, #0
; CHECK-NEXT: vmov s4, r0
; CHECK-NEXT: vadd.f32 s0, s4, s2
; CHECK-NEXT: vaddne.f32 s2, s4, s2
; CHECK-NEXT: vmulne.f32 s0, s0, s2
; CHECK-NEXT: vmov r0, s0
; CHECK-NEXT: bx lr
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
}
define float @add_twice_round_dynamic(float %x, float %y, i32 %n) #0 {
; CHECK-LABEL: add_twice_round_dynamic:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: vmov s0, r1
; CHECK-NEXT: cmp r2, #0
; CHECK-NEXT: vmov s2, r0
; CHECK-NEXT: vadd.f32 s0, s2, s0
; CHECK-NEXT: vmulne.f32 s0, s0, s0
; CHECK-NEXT: vmov r0, s0
; CHECK-NEXT: bx lr
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).
define float @set_rounding(float %x, float %y) {
; CHECK-LABEL: set_rounding:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: vmrs r2, fpscr
; CHECK-NEXT: vmov s2, r0
; CHECK-NEXT: vmov s0, r1
; CHECK-NEXT: vadd.f32 s0, s2, s0
; CHECK-NEXT: vsub.f32 s0, s0, s0
; CHECK-NEXT: orr r0, r2, #12582912
; CHECK-NEXT: vmsr fpscr, r0
; CHECK-NEXT: vmov r0, s0
; CHECK-NEXT: vmrs r1, fpscr
; CHECK-NEXT: bic r1, r1, #12582912
; CHECK-NEXT: vmsr fpscr, r1
; CHECK-NEXT: bx lr
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
}
define float @set_rounding_fpexcept_strict(float %x, float %y) #0 {
; CHECK-LABEL: set_rounding_fpexcept_strict:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: vmov s0, r1
; CHECK-NEXT: vmov s2, r0
; CHECK-NEXT: vadd.f32 s4, s2, s0
; CHECK-NEXT: vmrs r0, fpscr
; CHECK-NEXT: orr r0, r0, #12582912
; CHECK-NEXT: vmsr fpscr, r0
; CHECK-NEXT: vadd.f32 s0, s2, s0
; CHECK-NEXT: vmrs r0, fpscr
; CHECK-NEXT: bic r0, r0, #12582912
; CHECK-NEXT: vmsr fpscr, r0
; CHECK-NEXT: vsub.f32 s0, s4, s0
; CHECK-NEXT: vmov r0, s0
; CHECK-NEXT: bx lr
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
}
define float @set_rounding_round_dynamic(float %x, float %y) #0 {
; CHECK-LABEL: set_rounding_round_dynamic:
; CHECK: @ %bb.0: @ %entry
; CHECK-NEXT: vmov s2, r0
; CHECK-NEXT: vmrs r0, fpscr
; CHECK-NEXT: vmov s0, r1
; CHECK-NEXT: vadd.f32 s4, s2, s0
; CHECK-NEXT: orr r0, r0, #12582912
; CHECK-NEXT: vmsr fpscr, r0
; CHECK-NEXT: vmrs r0, fpscr
; CHECK-NEXT: vadd.f32 s0, s2, s0
; CHECK-NEXT: bic r0, r0, #12582912
; CHECK-NEXT: vmsr fpscr, r0
; CHECK-NEXT: vsub.f32 s0, s4, s0
; CHECK-NEXT: vmov r0, s0
; CHECK-NEXT: bx lr
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 }
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