| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc < %s -mtriple=i686-- -mattr=+sse4.1 | FileCheck %s |
| |
| ; Test that when we don't -enable-unsafe-fp-math, we don't do the optimization |
| ; -0 - (A - B) to (B - A) because A==B, -0 != 0 |
| |
| define float @negfp(float %a, float %b) nounwind { |
| ; CHECK-LABEL: negfp: |
| ; CHECK: # %bb.0: # %entry |
| ; CHECK-NEXT: pushl %eax |
| ; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero |
| ; CHECK-NEXT: subss {{[0-9]+}}(%esp), %xmm0 |
| ; CHECK-NEXT: xorps {{\.?LCPI[0-9]+_[0-9]+}}, %xmm0 |
| ; CHECK-NEXT: movss %xmm0, (%esp) |
| ; CHECK-NEXT: flds (%esp) |
| ; CHECK-NEXT: popl %eax |
| ; CHECK-NEXT: retl |
| entry: |
| %sub = fsub float %a, %b ; <float> [#uses=1] |
| %neg = fsub float -0.000000e+00, %sub ; <float> [#uses=1] |
| ret float %neg |
| } |
| |
| ; This may infinite loop if isNegatibleForFree and getNegatedExpression are conflicted. |
| |
| define double @negation_propagation(ptr %arg, double %arg1, double %arg2) nounwind { |
| ; CHECK-LABEL: negation_propagation: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: pushl %ebp |
| ; CHECK-NEXT: movl %esp, %ebp |
| ; CHECK-NEXT: andl $-8, %esp |
| ; CHECK-NEXT: subl $8, %esp |
| ; CHECK-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero |
| ; CHECK-NEXT: divsd 12(%ebp), %xmm0 |
| ; CHECK-NEXT: movsd {{.*#+}} xmm1 = mem[0],zero |
| ; CHECK-NEXT: mulsd %xmm0, %xmm1 |
| ; CHECK-NEXT: movapd %xmm0, %xmm2 |
| ; CHECK-NEXT: mulsd %xmm0, %xmm2 |
| ; CHECK-NEXT: mulsd %xmm0, %xmm2 |
| ; CHECK-NEXT: subsd %xmm2, %xmm1 |
| ; CHECK-NEXT: movsd %xmm1, (%esp) |
| ; CHECK-NEXT: fldl (%esp) |
| ; CHECK-NEXT: movl %ebp, %esp |
| ; CHECK-NEXT: popl %ebp |
| ; CHECK-NEXT: retl |
| %t = fdiv double 1.0, %arg1 |
| %t7 = fmul double %t, %arg2 |
| %t10 = fneg double %t7 |
| %t11 = fmul double %t, %t |
| %t13 = fsub double %t11, %t |
| %t14 = fneg double %t |
| %t15 = fmul double %t, %t14 |
| %t16 = fmul double %t, %t15 |
| %t18 = fadd double %t16, %t7 |
| ret double %t18 |
| } |
| |
| ; This would crash because the negated expression for %sub4 |
| ; creates a new use of %sub1 and that alters the negated cost |
| |
| define float @fdiv_extra_use_changes_cost(float %a0, float %a1, float %a2) nounwind { |
| ; CHECK-LABEL: fdiv_extra_use_changes_cost: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: pushl %eax |
| ; CHECK-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero |
| ; CHECK-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero |
| ; CHECK-NEXT: subss {{[0-9]+}}(%esp), %xmm1 |
| ; CHECK-NEXT: movaps %xmm1, %xmm2 |
| ; CHECK-NEXT: mulss %xmm0, %xmm2 |
| ; CHECK-NEXT: subss %xmm1, %xmm0 |
| ; CHECK-NEXT: divss %xmm2, %xmm0 |
| ; CHECK-NEXT: movss %xmm0, (%esp) |
| ; CHECK-NEXT: flds (%esp) |
| ; CHECK-NEXT: popl %eax |
| ; CHECK-NEXT: retl |
| %sub1 = fsub fast float %a0, %a1 |
| %mul2 = fmul fast float %sub1, %a2 |
| %neg = fneg fast float %a0 |
| %add3 = fadd fast float %a1, %neg |
| %sub4 = fadd fast float %add3, %a2 |
| %div5 = fdiv fast float %sub4, %mul2 |
| ret float %div5 |
| } |
| |
| ; PR55758 - this is not -(-X) |
| |
| define <2 x i64> @fneg_mismatched_sizes(<4 x float> %x) { |
| ; CHECK-LABEL: fneg_mismatched_sizes: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: xorps {{\.?LCPI[0-9]+_[0-9]+}}, %xmm0 |
| ; CHECK-NEXT: xorps {{\.?LCPI[0-9]+_[0-9]+}}, %xmm0 |
| ; CHECK-NEXT: retl |
| %n = fneg <4 x float> %x |
| %b = bitcast <4 x float> %n to <2 x i64> |
| %r = xor <2 x i64> %b, <i64 -9223372036854775808, i64 -9223372036854775808> |
| ret <2 x i64> %r |
| } |