derek.holloway
7502bf64a4
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67 lines
1.9 KiB
LLVM
67 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=riscv64-unknown-linux-gnu -mattr=+m | FileCheck %s
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; Test optimization of 32-bit unsigned division by constants with 33-bit magic
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; constants (IsAdd=true) on RISC-V64. The optimization uses the mulhu instruction.
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define i32 @udiv_by_7(i32 %x) nounwind {
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; CHECK-LABEL: udiv_by_7:
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; CHECK: # %bb.0:
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; CHECK-NEXT: slli a0, a0, 32
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; CHECK-NEXT: lui a1, 293
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; CHECK-NEXT: srli a0, a0, 32
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; CHECK-NEXT: addi a1, a1, -1755
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; CHECK-NEXT: slli a1, a1, 12
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; CHECK-NEXT: addi a1, a1, -1755
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; CHECK-NEXT: slli a1, a1, 29
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; CHECK-NEXT: mulhu a0, a0, a1
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; CHECK-NEXT: ret
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%div = udiv i32 %x, 7
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ret i32 %div
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}
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define i32 @udiv_by_19(i32 %x) nounwind {
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; CHECK-LABEL: udiv_by_19:
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; CHECK: # %bb.0:
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; CHECK-NEXT: slli a0, a0, 32
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; CHECK-NEXT: lui a1, 717447
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; CHECK-NEXT: srli a0, a0, 32
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; CHECK-NEXT: addi a1, a1, -1077
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; CHECK-NEXT: slli a1, a1, 31
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; CHECK-NEXT: srli a1, a1, 4
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; CHECK-NEXT: mulhu a0, a0, a1
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; CHECK-NEXT: ret
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%div = udiv i32 %x, 19
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ret i32 %div
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}
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define i32 @udiv_by_21(i32 %x) nounwind {
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; CHECK-LABEL: udiv_by_21:
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; CHECK: # %bb.0:
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; CHECK-NEXT: slli a0, a0, 32
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; CHECK-NEXT: lui a1, 549254
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; CHECK-NEXT: srli a0, a0, 32
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; CHECK-NEXT: addi a1, a1, 391
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; CHECK-NEXT: slli a1, a1, 31
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; CHECK-NEXT: srli a1, a1, 4
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; CHECK-NEXT: mulhu a0, a0, a1
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; CHECK-NEXT: ret
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%div = udiv i32 %x, 21
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ret i32 %div
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}
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; Test non-optimized case
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define i32 @udiv_by_3(i32 %x) nounwind {
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; CHECK-LABEL: udiv_by_3:
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; CHECK: # %bb.0:
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; CHECK-NEXT: slli a0, a0, 32
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; CHECK-NEXT: lui a1, 699051
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; CHECK-NEXT: addi a1, a1, -1365
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; CHECK-NEXT: slli a1, a1, 32
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; CHECK-NEXT: mulhu a0, a0, a1
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; CHECK-NEXT: srli a0, a0, 33
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; CHECK-NEXT: ret
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%div = udiv i32 %x, 3
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ret i32 %div
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}
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