derek.holloway
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44 lines
1.5 KiB
LLVM
44 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc < %s -mtriple=riscv64 -mattr=+v -verify-machineinstrs | FileCheck %s
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; Use cttz to test if we properly prove never-zero. There is a very
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; simple transform from cttz -> cttz_zero_poison if its operand is
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; known never zero.
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; Even without vscale_range, vscale is always guaranteed to be non-zero.
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define i32 @vscale_known_nonzero() {
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; CHECK-LABEL: vscale_known_nonzero:
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; CHECK: # %bb.0:
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; CHECK-NEXT: csrr a0, vlenb
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; CHECK-NEXT: srli a1, a0, 3
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; CHECK-NEXT: slli a2, a0, 1
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; CHECK-NEXT: slli a3, a0, 3
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; CHECK-NEXT: slli a4, a0, 5
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; CHECK-NEXT: slli a5, a0, 7
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; CHECK-NEXT: sub a1, a1, a2
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; CHECK-NEXT: slli a2, a0, 9
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; CHECK-NEXT: add a3, a3, a4
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; CHECK-NEXT: slli a4, a0, 13
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; CHECK-NEXT: sub a5, a5, a2
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; CHECK-NEXT: slli a2, a0, 15
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; CHECK-NEXT: sub a4, a4, a2
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; CHECK-NEXT: add a1, a1, a3
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; CHECK-NEXT: slli a2, a0, 11
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; CHECK-NEXT: sub a5, a5, a2
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; CHECK-NEXT: slli a2, a0, 20
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; CHECK-NEXT: sub a4, a4, a2
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; CHECK-NEXT: slli a0, a0, 24
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; CHECK-NEXT: add a1, a1, a5
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; CHECK-NEXT: add a0, a4, a0
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; CHECK-NEXT: add a0, a1, a0
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; CHECK-NEXT: srliw a0, a0, 27
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; CHECK-NEXT: lui a1, %hi(.LCPI0_0)
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; CHECK-NEXT: addi a1, a1, %lo(.LCPI0_0)
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; CHECK-NEXT: add a0, a1, a0
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; CHECK-NEXT: lbu a0, 0(a0)
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; CHECK-NEXT: ret
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%x = call i32 @llvm.vscale()
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%r = call i32 @llvm.cttz.i32(i32 %x, i1 false)
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ret i32 %r
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}
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