242ebcf13e
This consists of marking the various strict opcodes as legal, and adjusting instruction selection patterns so that 'op' is 'any_op'. The changes are similar to those in D114946 for AArch64. Custom lowering and promotion are set for some FP16 strict ops to work correctly. This PR is part of the work on adding strict FP support in ARM, which was previously discussed in #137101.
203 lines
7.3 KiB
LLVM
203 lines
7.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc -mtriple armv7-- -mattr=+vfp4 %s -o - | FileCheck %s
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; Div whose result is unused should be removed unless we have strict exceptions
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define void @unused_div(float %x, float %y) {
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; CHECK-LABEL: unused_div:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: bx lr
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entry:
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%add = fdiv float %x, %y
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ret void
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}
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define void @unused_div_fpexcept_strict(float %x, float %y) #0 {
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; CHECK-LABEL: unused_div_fpexcept_strict:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: vmov s0, r1
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; CHECK-NEXT: vmov s2, r0
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; CHECK-NEXT: vdiv.f32 s0, s2, s0
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; CHECK-NEXT: bx lr
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entry:
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%add = call float @llvm.experimental.constrained.fdiv.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
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ret void
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}
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define void @unused_div_round_dynamic(float %x, float %y) #0 {
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; CHECK-LABEL: unused_div_round_dynamic:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: bx lr
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entry:
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%add = call float @llvm.experimental.constrained.fdiv.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0
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ret void
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}
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; Machine CSE should eliminate the second add unless we have strict exceptions
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define float @add_twice(float %x, float %y, i32 %n) {
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; CHECK-LABEL: add_twice:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: vmov s0, r1
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; CHECK-NEXT: cmp r2, #0
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; CHECK-NEXT: vmov s2, r0
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; CHECK-NEXT: vadd.f32 s0, s2, s0
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; CHECK-NEXT: vmul.f32 s2, s0, s0
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; CHECK-NEXT: vmoveq.f32 s2, s0
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; CHECK-NEXT: vmov r0, s2
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; CHECK-NEXT: bx lr
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entry:
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%add = fadd float %x, %y
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%tobool.not = icmp eq i32 %n, 0
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br i1 %tobool.not, label %if.end, label %if.then
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if.then:
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%add1 = fadd float %x, %y
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%mul = fmul float %add, %add1
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br label %if.end
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if.end:
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%a.0 = phi float [ %mul, %if.then ], [ %add, %entry ]
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ret float %a.0
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}
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define float @add_twice_fpexcept_strict(float %x, float %y, i32 %n) #0 {
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; CHECK-LABEL: add_twice_fpexcept_strict:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: vmov s2, r1
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; CHECK-NEXT: cmp r2, #0
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; CHECK-NEXT: vmov s4, r0
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; CHECK-NEXT: vadd.f32 s0, s4, s2
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; CHECK-NEXT: vaddne.f32 s2, s4, s2
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; CHECK-NEXT: vmulne.f32 s0, s0, s2
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; CHECK-NEXT: vmov r0, s0
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; CHECK-NEXT: bx lr
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entry:
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%add = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
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%tobool.not = icmp eq i32 %n, 0
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br i1 %tobool.not, label %if.end, label %if.then
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if.then:
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%add1 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
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%mul = call float @llvm.experimental.constrained.fmul.f32(float %add, float %add1, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
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br label %if.end
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if.end:
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%a.0 = phi float [ %mul, %if.then ], [ %add, %entry ]
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ret float %a.0
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}
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define float @add_twice_round_dynamic(float %x, float %y, i32 %n) #0 {
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; CHECK-LABEL: add_twice_round_dynamic:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: vmov s0, r1
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; CHECK-NEXT: cmp r2, #0
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; CHECK-NEXT: vmov s2, r0
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; CHECK-NEXT: vadd.f32 s0, s2, s0
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; CHECK-NEXT: vmulne.f32 s0, s0, s0
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; CHECK-NEXT: vmov r0, s0
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; CHECK-NEXT: bx lr
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entry:
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%add = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0
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%tobool.not = icmp eq i32 %n, 0
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br i1 %tobool.not, label %if.end, label %if.then
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if.then:
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%add1 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0
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%mul = call float @llvm.experimental.constrained.fmul.f32(float %add, float %add1, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0
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br label %if.end
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if.end:
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%a.0 = phi float [ %mul, %if.then ], [ %add, %entry ]
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ret float %a.0
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}
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; Two adds separated by llvm.set.rounding should be preserved when rounding is
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; dynamic (as they may give different results) or when we have strict exceptions
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; (the llvm.set.rounding is irrelevant, but both could trap).
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define float @set_rounding(float %x, float %y) {
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; CHECK-LABEL: set_rounding:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: vmrs r2, fpscr
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; CHECK-NEXT: vmov s2, r0
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; CHECK-NEXT: vmov s0, r1
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; CHECK-NEXT: vadd.f32 s0, s2, s0
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; CHECK-NEXT: vsub.f32 s0, s0, s0
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; CHECK-NEXT: orr r0, r2, #12582912
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; CHECK-NEXT: vmsr fpscr, r0
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; CHECK-NEXT: vmov r0, s0
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; CHECK-NEXT: vmrs r1, fpscr
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; CHECK-NEXT: bic r1, r1, #12582912
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; CHECK-NEXT: vmsr fpscr, r1
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; CHECK-NEXT: bx lr
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entry:
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%add1 = fadd float %x, %y
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call void @llvm.set.rounding(i32 0)
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%add2 = fadd float %x, %y
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call void @llvm.set.rounding(i32 1)
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%sub = fsub float %add1, %add2
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ret float %sub
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}
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define float @set_rounding_fpexcept_strict(float %x, float %y) #0 {
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; CHECK-LABEL: set_rounding_fpexcept_strict:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: vmov s0, r1
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; CHECK-NEXT: vmov s2, r0
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; CHECK-NEXT: vadd.f32 s4, s2, s0
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; CHECK-NEXT: vmrs r0, fpscr
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; CHECK-NEXT: orr r0, r0, #12582912
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; CHECK-NEXT: vmsr fpscr, r0
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; CHECK-NEXT: vadd.f32 s0, s2, s0
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; CHECK-NEXT: vmrs r0, fpscr
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; CHECK-NEXT: bic r0, r0, #12582912
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; CHECK-NEXT: vmsr fpscr, r0
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; CHECK-NEXT: vsub.f32 s0, s4, s0
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; CHECK-NEXT: vmov r0, s0
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; CHECK-NEXT: bx lr
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entry:
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%add1 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
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call void @llvm.set.rounding(i32 0) #0
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%add2 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
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call void @llvm.set.rounding(i32 1) #0
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%sub = call float @llvm.experimental.constrained.fsub.f32(float %add1, float %add2, metadata !"round.tonearest", metadata !"fpexcept.strict") #0
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ret float %sub
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}
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define float @set_rounding_round_dynamic(float %x, float %y) #0 {
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; CHECK-LABEL: set_rounding_round_dynamic:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: vmov s2, r0
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; CHECK-NEXT: vmrs r0, fpscr
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; CHECK-NEXT: vmov s0, r1
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; CHECK-NEXT: vadd.f32 s4, s2, s0
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; CHECK-NEXT: orr r0, r0, #12582912
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; CHECK-NEXT: vmsr fpscr, r0
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; CHECK-NEXT: vmrs r0, fpscr
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; CHECK-NEXT: vadd.f32 s0, s2, s0
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; CHECK-NEXT: bic r0, r0, #12582912
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; CHECK-NEXT: vmsr fpscr, r0
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; CHECK-NEXT: vsub.f32 s0, s4, s0
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; CHECK-NEXT: vmov r0, s0
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; CHECK-NEXT: bx lr
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entry:
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%add1 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0
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call void @llvm.set.rounding(i32 0) #0
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%add2 = call float @llvm.experimental.constrained.fadd.f32(float %x, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0
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call void @llvm.set.rounding(i32 1) #0
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%sub = call float @llvm.experimental.constrained.fsub.f32(float %add1, float %add2, metadata !"round.dynamic", metadata !"fpexcept.ignore") #0
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ret float %sub
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}
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declare float @llvm.experimental.constrained.fadd.f32(float, float, metadata, metadata)
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declare float @llvm.experimental.constrained.fsub.f32(float, float, metadata, metadata)
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declare float @llvm.experimental.constrained.fmul.f32(float, float, metadata, metadata)
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declare float @llvm.experimental.constrained.fdiv.f32(float, float, metadata, metadata)
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declare i32 @llvm.get.rounding()
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declare void @llvm.set.rounding(i32)
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attributes #0 = { strictfp }
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