6699029b67
We tend to assume that the AA pipeline is by default the default AA pipeline and it's confusing when it's empty instead. PR48779 Initially reverted due to BasicAA running analyses in an unspecified order (multiple function calls as parameters), fixed by fetching analyses before the call to construct BasicAA. Reviewed By: asbirlea Differential Revision: https://reviews.llvm.org/D95117
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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