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TheRock/compiler/amd-llvm/llvm/test/CodeGen/SystemZ/fp-neg-01.ll
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derek.holloway 7502bf64a4
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2026-09-02 16:34:47 -07:00

50 lines
1.1 KiB
LLVM

; 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 f16.
define half @f0(half %f) {
; CHECK-LABEL: f0:
; CHECK: # %bb.0:
; CHECK-NEXT: lcdfr %f0, %f0
; CHECK-NEXT: br %r14
%res = fneg half %f
ret half %res
}
; Test f32.
define float @f1(float %f) {
; CHECK-LABEL: f1:
; CHECK: lcdfr %f0, %f0
; CHECK: br %r14
%res = fneg float %f
ret float %res
}
; Test f64.
define double @f2(double %f) {
; CHECK-LABEL: f2:
; CHECK: lcdfr %f0, %f0
; CHECK: br %r14
%res = fneg double %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(ptr %ptr, ptr %ptr2) {
; CHECK-LABEL: f3:
; CHECK: lcxbr
; CHECK: dxbr
; CHECK: br %r14
%orig = load fp128, ptr %ptr
%negzero = fpext float -0.0 to fp128
%neg = fneg fp128 %orig
%op2 = load fp128, ptr %ptr2
%res = fdiv fp128 %neg, %op2
store fp128 %res, ptr %ptr
ret void
}