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bc658bf60a
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
18 lines
461 B
LLVM
18 lines
461 B
LLVM
; Test 128-bit floating-point square root on z14.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 | FileCheck %s
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declare fp128 @llvm.sqrt.f128(fp128 %f)
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define void @f1(fp128 *%ptr) {
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; CHECK-LABEL: f1:
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; CHECK-DAG: vl [[REG:%v[0-9]+]], 0(%r2)
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; CHECK: wfsqxb [[RES:%v[0-9]+]], [[REG]]
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; CHECK: vst [[RES]], 0(%r2)
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; CHECK: br %r14
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%f = load fp128, fp128 *%ptr
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%res = call fp128 @llvm.sqrt.f128(fp128 %f)
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store fp128 %res, fp128 *%ptr
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ret void
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}
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