| ; Test floating-point negation. |
| ; |
| ; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s |
| ; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s |
| |
| ; Test f32. |
| define float @f1(float %f) { |
| ; CHECK-LABEL: f1: |
| ; CHECK: lcdfr %f0, %f0 |
| ; CHECK: br %r14 |
| %res = fsub float -0.0, %f |
| ret float %res |
| } |
| |
| ; Test f64. |
| define double @f2(double %f) { |
| ; CHECK-LABEL: f2: |
| ; CHECK: lcdfr %f0, %f0 |
| ; CHECK: br %r14 |
| %res = fsub double -0.0, %f |
| ret double %res |
| } |
| |
| ; Test f128. With the loads and stores, a pure negation would probably |
| ; be better implemented using an XI on the upper byte. Do some extra |
| ; processing so that using FPRs is unequivocally better. |
| define void @f3(fp128 *%ptr, fp128 *%ptr2) { |
| ; CHECK-LABEL: f3: |
| ; CHECK: lcxbr |
| ; CHECK: dxbr |
| ; CHECK: br %r14 |
| %orig = load fp128, fp128 *%ptr |
| %negzero = fpext float -0.0 to fp128 |
| %neg = fsub fp128 0xL00000000000000008000000000000000, %orig |
| %op2 = load fp128, fp128 *%ptr2 |
| %res = fdiv fp128 %neg, %op2 |
| store fp128 %res, fp128 *%ptr |
| ret void |
| } |
