fp-une-cmp.ll
3.18 KB
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
; <rdar://problem/7859988>
; Make sure we don't generate more jumps than we need to. We used to generate
; something like this:
;
; jne LBB0_1
; jnp LBB0_2
; LBB0_1:
; jmp LBB0_3
; LBB0_2:
; addsd ...
; LBB0_3:
;
; Now we generate this:
;
; jne LBB0_2
; jp LBB0_2
; addsd ...
; LBB0_2:
define double @rdar_7859988(double %x, double %y) nounwind readnone optsize ssp {
; CHECK-LABEL: rdar_7859988:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: mulsd %xmm1, %xmm0
; CHECK-NEXT: xorpd %xmm1, %xmm1
; CHECK-NEXT: ucomisd %xmm1, %xmm0
; CHECK-NEXT: jne .LBB0_2
; CHECK-NEXT: jp .LBB0_2
; CHECK-NEXT: # %bb.1: # %bb1
; CHECK-NEXT: addsd {{.*}}(%rip), %xmm0
; CHECK-NEXT: .LBB0_2: # %bb2
; CHECK-NEXT: retq
entry:
%mul = fmul double %x, %y
%cmp = fcmp oeq double %mul, 0.000000e+00
br i1 %cmp, label %bb1, label %bb2
bb1:
%add = fadd double %mul, -1.000000e+00
br label %bb2
bb2:
%phi = phi double [ %add, %bb1 ], [ %mul, %entry ]
ret double %phi
}
define double @profile_metadata(double %x, double %y) {
; CHECK-LABEL: profile_metadata:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: mulsd %xmm1, %xmm0
; CHECK-NEXT: xorpd %xmm1, %xmm1
; CHECK-NEXT: ucomisd %xmm1, %xmm0
; CHECK-NEXT: jne .LBB1_1
; CHECK-NEXT: jp .LBB1_1
; CHECK-NEXT: # %bb2
; CHECK-NEXT: retq
; CHECK-NEXT: .LBB1_1: # %bb1
; CHECK-NEXT: addsd {{.*}}(%rip), %xmm0
; CHECK-NEXT: retq
entry:
%mul = fmul double %x, %y
%cmp = fcmp une double %mul, 0.000000e+00
br i1 %cmp, label %bb1, label %bb2, !prof !1
bb1:
%add = fadd double %mul, -1.000000e+00
br label %bb2
bb2:
%phi = phi double [ %add, %bb1 ], [ %mul, %entry ]
ret double %phi
}
; Test if the negation of the non-equality check between floating points are
; translated to jnp followed by jne.
define void @foo(float %f) {
; CHECK-LABEL: foo:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: xorps %xmm1, %xmm1
; CHECK-NEXT: ucomiss %xmm1, %xmm0
; CHECK-NEXT: jne .LBB2_2
; CHECK-NEXT: jnp .LBB2_1
; CHECK-NEXT: .LBB2_2: # %if.then
; CHECK-NEXT: jmp a # TAILCALL
; CHECK-NEXT: .LBB2_1: # %if.end
; CHECK-NEXT: retq
entry:
%cmp = fcmp une float %f, 0.000000e+00
br i1 %cmp, label %if.then, label %if.end
if.then:
tail call void @a()
br label %if.end
if.end:
ret void
}
; Test that an FP oeq/une conditional branch can be inverted successfully even
; when the true and false targets are the same (PR27750).
;
; CHECK-LABEL: pr27750
; CHECK: ucomiss
; CHECK-NEXT: jne [[TARGET:.*]]
; CHECK-NEXT: jp [[TARGET]]
define void @pr27750(i32* %b, float %x, i1 %y) {
entry:
br label %for.cond
for.cond:
br label %for.cond1
for.cond1:
br i1 %y, label %for.body3.lr.ph, label %for.end
for.body3.lr.ph:
store i32 0, i32* %b, align 4
br label %for.end
for.end:
; After block %for.cond gets eliminated, the two target blocks of this
; conditional block are the same.
%tobool = fcmp une float %x, 0.000000e+00
br i1 %tobool, label %for.cond, label %for.cond1
}
declare void @a()
!1 = !{!"branch_weights", i32 1, i32 1000}