78b8ce40ef
This reverts commit329aeb5db4, and relands commit61f006ac65. This is a continuation of D89456. As it was suggested there, now that SCEV models `PtrToInt`, we can try to improve SCEV's pointer handling. In particular, i believe, i will need this in the future to further fix `SCEVAddExpr`operation type handling. This removes special handling of `ConstantPointerNull` from `ScalarEvolution::createSCEV()`, and add constant folding into `ScalarEvolution::getPtrToIntExpr()`. This way, `null` constants stay as such in SCEV's, but gracefully become zero integers when asked. Reviewed By: Meinersbur Differential Revision: https://reviews.llvm.org/D98147
40 lines
1.1 KiB
LLVM
40 lines
1.1 KiB
LLVM
; RUN: opt %loadPolly -polly-codegen -S < %s | FileCheck %s
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;
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; Scalar write of bitcasted value. Instead of writing %b of type
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; %structty, the SCEV expression looks through the bitcast such that
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; SCEVExpander returns %add.ptr81.i of type i8* to be the new value
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; of %b.
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;
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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%structty = type { %structty*, %structty*, i32, [2 x i64] }
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define void @bitmap_set_range() {
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entry:
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%a = ptrtoint i8* undef to i64
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br label %cond.end32.i
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cond.end32.i:
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br i1 false, label %cond.true67.i, label %cond.end73.i
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cond.true67.i:
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br label %cond.end73.i
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cond.end73.i:
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%add.ptr81.i = getelementptr inbounds i8, i8* null, i64 %a
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%b = bitcast i8* %add.ptr81.i to %structty*
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br label %bitmap_element_allocate.exit
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bitmap_element_allocate.exit:
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%tobool43 = icmp eq %structty* %b, null
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ret void
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}
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; CHECK: polly.stmt.cond.end73.i:
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; CHECK-NEXT: %scevgep = getelementptr i8, i8* null, i64 %a
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; CHECK-NEXT: %scevgep1 = bitcast i8* %scevgep to %structty*
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; CHECK-NEXT: store %structty* %scevgep1, %structty** %b.s2a, align 8
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; CHECK-NEXT: br label %polly.exiting
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