derek.holloway
7502bf64a4
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62 lines
1.9 KiB
LLVM
62 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=aarch64-unknown-linux | 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 AArch64. The optimization uses the umulh 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: mov x8, #2684354560 // =0xa0000000
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; CHECK-NEXT: mov w9, w0
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; CHECK-NEXT: movk x8, #18724, lsl #32
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; CHECK-NEXT: movk x8, #9362, lsl #48
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; CHECK-NEXT: umulh x0, x9, x8
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; CHECK-NEXT: // kill: def $w0 killed $w0 killed $x0
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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: mov x8, #1476395008 // =0x58000000
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; CHECK-NEXT: mov w9, w0
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; CHECK-NEXT: movk x8, #17246, lsl #32
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; CHECK-NEXT: movk x8, #3449, lsl #48
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; CHECK-NEXT: umulh x0, x9, x8
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; CHECK-NEXT: // kill: def $w0 killed $w0 killed $x0
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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: mov x8, #939524096 // =0x38000000
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; CHECK-NEXT: mov w9, w0
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; CHECK-NEXT: movk x8, #49932, lsl #32
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; CHECK-NEXT: movk x8, #3120, lsl #48
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; CHECK-NEXT: umulh x0, x9, x8
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; CHECK-NEXT: // kill: def $w0 killed $w0 killed $x0
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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: mov w8, #43691 // =0xaaab
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; CHECK-NEXT: movk w8, #43690, lsl #16
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; CHECK-NEXT: umull x8, w0, w8
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; CHECK-NEXT: lsr x0, x8, #33
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; CHECK-NEXT: // kill: def $w0 killed $w0 killed $x0
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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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