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