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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
51 lines
1.1 KiB
LLVM
51 lines
1.1 KiB
LLVM
; Test f128 floating-point truncations/extensions 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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; Test f128->f64.
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define double @f1(fp128 *%ptr) {
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; CHECK-LABEL: f1:
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; CHECK: vl [[REG:%v[0-9]+]], 0(%r2)
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; CHECK: wflrx %f0, [[REG]], 0, 0
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; CHECK: br %r14
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%val = load fp128, fp128 *%ptr
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%res = fptrunc fp128 %val to double
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ret double %res
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}
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; Test f128->f32.
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define float @f2(fp128 *%ptr) {
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; CHECK-LABEL: f2:
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; CHECK: vl [[REG:%v[0-9]+]], 0(%r2)
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; CHECK: wflrx %f0, [[REG]], 0, 3
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; CHECK: ledbra %f0, 0, %f0, 0
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; CHECK: br %r14
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%val = load fp128, fp128 *%ptr
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%res = fptrunc fp128 %val to float
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ret float %res
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}
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; Test f64->f128.
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define void @f3(fp128 *%dst, double %val) {
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; CHECK-LABEL: f3:
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; CHECK: wflld [[RES:%v[0-9]+]], %f0
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; CHECK: vst [[RES]], 0(%r2)
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; CHECK: br %r14
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%res = fpext double %val to fp128
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store fp128 %res, fp128 *%dst
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ret void
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}
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; Test f32->f128.
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define void @f4(fp128 *%dst, float %val) {
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; CHECK-LABEL: f4:
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; CHECK: ldebr %f0, %f0
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; CHECK: wflld [[RES:%v[0-9]+]], %f0
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; CHECK: vst [[RES]], 0(%r2)
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; CHECK: br %r14
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%res = fpext float %val to fp128
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store fp128 %res, fp128 *%dst
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ret void
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}
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