diff options
Diffstat (limited to 'llvm/test/CodeGen/ARM/strict-fp-ops.ll')
| -rw-r--r-- | llvm/test/CodeGen/ARM/strict-fp-ops.ll | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/ARM/strict-fp-ops.ll b/llvm/test/CodeGen/ARM/strict-fp-ops.ll new file mode 100644 index 0000000..608ab07 --- /dev/null +++ b/llvm/test/CodeGen/ARM/strict-fp-ops.ll @@ -0,0 +1,202 @@ +; 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 } |