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Diffstat (limited to 'test/CodeGen/SystemZ/fp-neg-02.ll')
-rw-r--r-- | test/CodeGen/SystemZ/fp-neg-02.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/fp-neg-02.ll b/test/CodeGen/SystemZ/fp-neg-02.ll new file mode 100644 index 00000000000..c904d19947b --- /dev/null +++ b/test/CodeGen/SystemZ/fp-neg-02.ll @@ -0,0 +1,38 @@ +; Test floating-point negation on z14. +; +; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 | 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 +} |