derek.holloway
7502bf64a4
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41 lines
941 B
LLVM
41 lines
941 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; Test shortening of NILL to NILF when the result is used as a rotate amount.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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; Test 32-bit rotate.
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define i32 @f1(i32 %val, i32 %amt) {
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; CHECK-LABEL: f1:
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; CHECK: # %bb.0:
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; CHECK-NEXT: nill %r3, 15
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; CHECK-NEXT: rll %r2, %r2, 0(%r3)
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; CHECK-NEXT: br %r14
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%mod = urem i32 %amt, 16
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%inv = sub i32 32, %mod
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%parta = shl i32 %val, %mod
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%partb = lshr i32 %val, %inv
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%rotl = or i32 %parta, %partb
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ret i32 %rotl
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}
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; Test 64-bit rotate.
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define i64 @f2(i64 %val, i64 %amt) {
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; CHECK-LABEL: f2:
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; CHECK: # %bb.0:
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; CHECK-NEXT: nill %r3, 31
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; CHECK-NEXT: rllg %r2, %r2, 0(%r3)
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; CHECK-NEXT: br %r14
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%mod = urem i64 %amt, 32
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%inv = sub i64 64, %mod
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%parta = shl i64 %val, %mod
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%partb = lshr i64 %val, %inv
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%rotl = or i64 %parta, %partb
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ret i64 %rotl
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}
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