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llvm-project/llvm/test/CodeGen/SystemZ/fp-sqrt-04.ll

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[SystemZ] Add support for IBM z14 processor (3/3) This adds support for the new 128-bit vector float instructions of z14. Note that these instructions actually only operate on the f128 type, since only each 128-bit vector register can hold only one 128-bit float value. However, this is still preferable to the legacy 128-bit float instructions, since those operate on pairs of floating-point registers (so we can hold at most 8 values in registers), while the new instructions use single vector registers (so we hold up to 32 value in registers). Adding support includes: - Enabling the instructions for the assembler/disassembler. - CodeGen for the instructions. This includes allocating the f128 type now to the VR128BitRegClass instead of FP128BitRegClass. - Scheduler description support for the instructions. Note that for a small number of operations, we have no new vector instructions (like integer <-> 128-bit float conversions), and so we use the legacy instruction and then reformat the operand (i.e. copy between a pair of floating-point registers and a vector register). llvm-svn: 308196
2017-07-18 01:44:20 +08:00
; Test 128-bit floating-point square root on z14.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 | FileCheck %s
declare fp128 @llvm.sqrt.f128(fp128 %f)
define void @f1(fp128 *%ptr) {
; CHECK-LABEL: f1:
; CHECK-DAG: vl [[REG:%v[0-9]+]], 0(%r2)
; CHECK: wfsqxb [[RES:%v[0-9]+]], [[REG]]
; CHECK: vst [[RES]], 0(%r2)
; CHECK: br %r14
%f = load fp128, fp128 *%ptr
%res = call fp128 @llvm.sqrt.f128(fp128 %f)
store fp128 %res, fp128 *%ptr
ret void
}