| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -mcpu=core-avx2 < %s -O3 -S | FileCheck --check-prefix=ALL %s |
| ; RUN: opt -mcpu=core-avx2 < %s -passes='default<O3>' -S | FileCheck --check-prefix=ALL %s |
| |
| ; Not only should we be able to make the loop countable, |
| ; %whatever.next recurrence should be rewritten, making loop dead. |
| |
| target triple = "x86_64--" |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| |
| define i32 @cttz(i32 %n, i32* %p1) { |
| ; ALL-LABEL: @cttz( |
| ; ALL-NEXT: entry: |
| ; ALL-NEXT: [[TMP0:%.*]] = shl i32 [[N:%.*]], 1 |
| ; ALL-NEXT: [[TMP1:%.*]] = call i32 @llvm.cttz.i32(i32 [[TMP0]], i1 false), [[RNG0:!range !.*]] |
| ; ALL-NEXT: [[TMP2:%.*]] = sub nuw nsw i32 32, [[TMP1]] |
| ; ALL-NEXT: [[TMP3:%.*]] = sub nuw nsw i32 75, [[TMP1]] |
| ; ALL-NEXT: store i32 [[TMP3]], i32* [[P1:%.*]], align 4 |
| ; ALL-NEXT: ret i32 [[TMP2]] |
| ; |
| entry: |
| br label %while.cond |
| |
| while.cond: ; preds = %while.cond, %entry |
| %n.addr.0 = phi i32 [ %n, %entry ], [ %shl, %while.cond ] |
| %whatever = phi i32 [ 42, %entry ], [ %whatever.next, %while.cond ] |
| %i.0 = phi i32 [ 0, %entry ], [ %inc, %while.cond ] |
| %shl = shl i32 %n.addr.0, 1 |
| %tobool = icmp eq i32 %shl, 0 |
| %inc = add nsw i32 %i.0, 1 |
| %whatever.next = add i32 %whatever, 1 |
| br i1 %tobool, label %while.end, label %while.cond |
| |
| while.end: ; preds = %while.cond |
| store i32 %whatever.next, i32* %p1 |
| ret i32 %i.0 |
| } |
