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