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cf0fa9b9dd
The z13 vector facility includes some instructions that operate only on the high f64 in a v2f64, effectively extending the FP register set from 16 to 32 registers. It's still better to use the old instructions if the operands happen to fit though, since the older instructions have a shorter encoding. Based on a patch by Richard Sandiford. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236524 91177308-0d34-0410-b5e6-96231b3b80d8
45 lines
1.2 KiB
LLVM
45 lines
1.2 KiB
LLVM
; Test negated floating-point absolute.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
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; Test f32.
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declare float @llvm.fabs.f32(float %f)
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define float @f1(float %f) {
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; CHECK-LABEL: f1:
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; CHECK: lnebr %f0, %f0
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; CHECK: br %r14
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%abs = call float @llvm.fabs.f32(float %f)
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%res = fsub float -0.0, %abs
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ret float %res
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}
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; Test f64.
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declare double @llvm.fabs.f64(double %f)
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define double @f2(double %f) {
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; CHECK-LABEL: f2:
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; CHECK: lndbr %f0, %f0
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; CHECK: br %r14
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%abs = call double @llvm.fabs.f64(double %f)
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%res = fsub double -0.0, %abs
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ret double %res
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}
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; Test f128. With the loads and stores, a pure negative-absolute would
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; probably be better implemented using an OI on the upper byte. Do some
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; extra processing so that using FPRs is unequivocally better.
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declare fp128 @llvm.fabs.f128(fp128 %f)
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define void @f3(fp128 *%ptr, fp128 *%ptr2) {
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; CHECK-LABEL: f3:
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; CHECK: lnxbr
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; CHECK: dxbr
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; CHECK: br %r14
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%orig = load fp128 , fp128 *%ptr
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%abs = call fp128 @llvm.fabs.f128(fp128 %orig)
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%negabs = fsub fp128 0xL00000000000000008000000000000000, %abs
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%op2 = load fp128 , fp128 *%ptr2
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%res = fdiv fp128 %negabs, %op2
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store fp128 %res, fp128 *%ptr
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ret void
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}
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