derek.holloway
7502bf64a4
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58 lines
2.2 KiB
LLVM
58 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; Instcombine should be able to eliminate the lshr, because only
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; bits in the operand which might be non-zero will be shifted
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; off the end.
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define i32 @hash_string(ptr nocapture %key) nounwind readonly {
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; CHECK-LABEL: @hash_string(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[T0:%.*]] = load i8, ptr [[KEY:%.*]], align 1
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; CHECK-NEXT: [[T1:%.*]] = icmp eq i8 [[T0]], 0
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; CHECK-NEXT: br i1 [[T1]], label [[BB2:%.*]], label [[BB:%.*]]
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; CHECK: bb:
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; CHECK-NEXT: [[INDVAR:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[T:%.*]], [[BB]] ]
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; CHECK-NEXT: [[K_04:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[T8:%.*]], [[BB]] ]
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; CHECK-NEXT: [[CP_05:%.*]] = getelementptr i8, ptr [[KEY]], i64 [[INDVAR]]
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; CHECK-NEXT: [[T2:%.*]] = shl nuw nsw i32 [[K_04]], 1
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; CHECK-NEXT: [[T5:%.*]] = load i8, ptr [[CP_05]], align 1
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; CHECK-NEXT: [[T6:%.*]] = sext i8 [[T5]] to i32
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; CHECK-NEXT: [[T7:%.*]] = xor i32 [[T2]], [[T6]]
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; CHECK-NEXT: [[T8]] = and i32 [[T7]], 16383
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; CHECK-NEXT: [[T]] = add i64 [[INDVAR]], 1
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; CHECK-NEXT: [[SCEVGEP:%.*]] = getelementptr i8, ptr [[KEY]], i64 [[T]]
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; CHECK-NEXT: [[T9:%.*]] = load i8, ptr [[SCEVGEP]], align 1
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; CHECK-NEXT: [[T10:%.*]] = icmp eq i8 [[T9]], 0
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; CHECK-NEXT: br i1 [[T10]], label [[BB2]], label [[BB]]
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; CHECK: bb2:
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; CHECK-NEXT: [[K_0_LCSSA:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[T8]], [[BB]] ]
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; CHECK-NEXT: ret i32 [[K_0_LCSSA]]
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;
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entry:
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%t0 = load i8, ptr %key, align 1
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%t1 = icmp eq i8 %t0, 0
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br i1 %t1, label %bb2, label %bb
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bb:
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%indvar = phi i64 [ 0, %entry ], [ %t, %bb ]
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%k.04 = phi i32 [ 0, %entry ], [ %t8, %bb ]
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%cp.05 = getelementptr i8, ptr %key, i64 %indvar
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%t2 = shl i32 %k.04, 1
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%t3 = lshr i32 %k.04, 14
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%t4 = add i32 %t2, %t3
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%t5 = load i8, ptr %cp.05, align 1
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%t6 = sext i8 %t5 to i32
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%t7 = xor i32 %t6, %t4
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%t8 = and i32 %t7, 16383
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%t = add i64 %indvar, 1
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%scevgep = getelementptr i8, ptr %key, i64 %t
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%t9 = load i8, ptr %scevgep, align 1
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%t10 = icmp eq i8 %t9, 0
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br i1 %t10, label %bb2, label %bb
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bb2:
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%k.0.lcssa = phi i32 [ 0, %entry ], [ %t8, %bb ]
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ret i32 %k.0.lcssa
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}
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