5ab41a7a05
This is a subset of the original commit from rL359879 which was reverted because it could crash when using the 'RemovedInstructions' structure that enables delayed deletion of dead instructions. The motivating compile-time win does not require that change though. We should get most of that win from this change alone. Using/updating a dominator tree to match math overflow patterns may be very expensive in compile-time (because of the way CGP uses a DT), so just handle the single-block case. See post-commit thread for rL354298 for more details: http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20190422/646276.html Differential Revision: https://reviews.llvm.org/D61075 llvm-svn: 359969
34 lines
1.1 KiB
LLVM
34 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -codegenprepare < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i1 @PR41004(i32 %x, i32 %y, i32 %t1) {
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; CHECK-LABEL: @PR41004(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[T0:%.*]] = icmp eq i32 [[Y:%.*]], 1
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; CHECK-NEXT: br i1 [[T0]], label [[SELECT_TRUE_SINK:%.*]], label [[SELECT_END:%.*]]
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; CHECK: select.true.sink:
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; CHECK-NEXT: [[REM:%.*]] = srem i32 [[X:%.*]], 2
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; CHECK-NEXT: br label [[SELECT_END]]
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; CHECK: select.end:
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; CHECK-NEXT: [[MUL:%.*]] = phi i32 [ [[REM]], [[SELECT_TRUE_SINK]] ], [ 0, [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[NEG:%.*]] = add i32 [[T1:%.*]], -1
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; CHECK-NEXT: [[ADD:%.*]] = add i32 [[NEG]], [[MUL]]
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; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[T1]], 0
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; CHECK-NEXT: ret i1 [[TOBOOL]]
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;
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entry:
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%rem = srem i32 %x, 2
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%t0 = icmp eq i32 %y, 1
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%mul = select i1 %t0, i32 %rem, i32 0
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%neg = add i32 %t1, -1
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%add = add i32 %neg, %mul
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br label %if
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if:
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%tobool = icmp eq i32 %t1, 0
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ret i1 %tobool
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}
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