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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
34 lines
1.0 KiB
LLVM
34 lines
1.0 KiB
LLVM
; Test f128 comparisons 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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; There is no memory form of 128-bit comparison.
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define i64 @f1(i64 %a, i64 %b, fp128 *%ptr1, fp128 *%ptr2) {
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; CHECK-LABEL: f1:
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; CHECK-DAG: vl [[REG1:%v[0-9]+]], 0(%r4)
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; CHECK-DAG: vl [[REG2:%v[0-9]+]], 0(%r5)
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; CHECK: wfcxb [[REG1]], [[REG2]]
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; CHECK-NEXT: locgrne %r2, %r3
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; CHECK: br %r14
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%f1 = load fp128, fp128 *%ptr1
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%f2 = load fp128, fp128 *%ptr2
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%cond = fcmp oeq fp128 %f1, %f2
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%res = select i1 %cond, i64 %a, i64 %b
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ret i64 %res
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}
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; Check comparison with zero -- it is not worthwhile to copy to
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; FP pairs just so we can use LTXBR, so simply load up a zero.
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define i64 @f2(i64 %a, i64 %b, fp128 *%ptr) {
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; CHECK-LABEL: f2:
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; CHECK-DAG: vl [[REG1:%v[0-9]+]], 0(%r4)
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; CHECK-DAG: vzero [[REG2:%v[0-9]+]]
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; CHECK: wfcxb [[REG1]], [[REG2]]
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; CHECK-NEXT: locgrne %r2, %r3
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; CHECK: br %r14
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%f = load fp128, fp128 *%ptr
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%cond = fcmp oeq fp128 %f, 0xL00000000000000000000000000000000
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%res = select i1 %cond, i64 %a, i64 %b
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ret i64 %res
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}
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