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092d64512e
This should make it clearer how this proposed patch: http://reviews.llvm.org/D11393 ...will change codegen. llvm-svn: 262875
82 lines
1.9 KiB
LLVM
82 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
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; <rdar://problem/7859988>
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; Make sure we don't generate more jumps than we need to. We used to generate
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; something like this:
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;
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; jne LBB0_1
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; jnp LBB0_2
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; LBB0_1:
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; jmp LBB0_3
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; LBB0_2:
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; addsd ...
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; LBB0_3:
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;
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; Now we generate this:
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;
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; jne LBB0_2
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; jp LBB0_2
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; addsd ...
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; LBB0_2:
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define double @rdar_7859988(double %x, double %y) nounwind readnone optsize ssp {
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; CHECK-LABEL: rdar_7859988:
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; CHECK: # BB#0: # %entry
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; CHECK-NEXT: mulsd %xmm1, %xmm0
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; CHECK-NEXT: xorpd %xmm1, %xmm1
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; CHECK-NEXT: ucomisd %xmm1, %xmm0
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; CHECK-NEXT: jne .LBB0_2
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; CHECK-NEXT: jp .LBB0_2
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; CHECK-NEXT: # BB#1: # %bb1
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; CHECK-NEXT: addsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: .LBB0_2: # %bb2
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; CHECK-NEXT: retq
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entry:
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%mul = fmul double %x, %y
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%cmp = fcmp une double %mul, 0.000000e+00
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br i1 %cmp, label %bb2, label %bb1
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bb1:
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%add = fadd double %mul, -1.000000e+00
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br label %bb2
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bb2:
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%phi = phi double [ %add, %bb1 ], [ %mul, %entry ]
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ret double %phi
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}
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; FIXME: With branch weights indicated, bb2 should be placed ahead of bb1.
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define double @profile_metadata(double %x, double %y) {
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; CHECK-LABEL: profile_metadata:
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; CHECK: # BB#0: # %entry
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; CHECK-NEXT: mulsd %xmm1, %xmm0
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; CHECK-NEXT: xorpd %xmm1, %xmm1
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; CHECK-NEXT: ucomisd %xmm1, %xmm0
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; CHECK-NEXT: jne .LBB1_1
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; CHECK-NEXT: jnp .LBB1_2
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; CHECK-NEXT: .LBB1_1: # %bb1
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; CHECK-NEXT: addsd {{.*}}(%rip), %xmm0
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; CHECK-NEXT: .LBB1_2: # %bb2
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; CHECK-NEXT: retq
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entry:
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%mul = fmul double %x, %y
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%cmp = fcmp une double %mul, 0.000000e+00
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br i1 %cmp, label %bb1, label %bb2, !prof !1
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bb1:
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%add = fadd double %mul, -1.000000e+00
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br label %bb2
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bb2:
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%phi = phi double [ %add, %bb1 ], [ %mul, %entry ]
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ret double %phi
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}
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!1 = !{!"branch_weights", i32 1, i32 1000}
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