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f3ab4849fb
Now that we have fneg, prefer using it over "fsub -0.0, ...". This helps in particular with strict FP tests, as fneg does not raise any exceptions.
40 lines
977 B
LLVM
40 lines
977 B
LLVM
; Test floating-point negation.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
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; Test f32.
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define float @f1(float %f) {
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; CHECK-LABEL: f1:
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; CHECK: lcdfr %f0, %f0
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; CHECK: br %r14
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%res = fneg float %f
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ret float %res
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}
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; Test f64.
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define double @f2(double %f) {
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; CHECK-LABEL: f2:
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; CHECK: lcdfr %f0, %f0
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; CHECK: br %r14
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%res = fneg double %f
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ret double %res
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}
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; Test f128. With the loads and stores, a pure negation would probably
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; be better implemented using an XI on the upper byte. Do some extra
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; processing so that using FPRs is unequivocally better.
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define void @f3(fp128 *%ptr, fp128 *%ptr2) {
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; CHECK-LABEL: f3:
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; CHECK: lcxbr
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; CHECK: dxbr
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; CHECK: br %r14
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%orig = load fp128, fp128 *%ptr
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%negzero = fpext float -0.0 to fp128
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%neg = fneg fp128 %orig
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%op2 = load fp128, fp128 *%ptr2
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%res = fdiv fp128 %neg, %op2
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store fp128 %res, fp128 *%ptr
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ret void
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}
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