84c15bc018
This adds support for opaque pointers to expandAddToGEP() by always generating an i8 GEP for opaque pointers. After looking at some other cases (constexpr GEP folding, SROA GEP generation), I've come around to the idea that we should use i8 GEPs for opaque pointers, because the alternative would be to guess a GEP type from surrounding code, which will not be reliable. Ultimately, i8 GEPs is where we want to end up anyway, and opaque pointers just make that the natural choice. There are a couple of other places in SCEVExpander that check pointer element types, I plan to update those when I run across usable test coverage that doesn't assert elsewhere. Differential Revision: https://reviews.llvm.org/D105398
37 lines
1.3 KiB
LLVM
37 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -loop-reduce < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-n32:64"
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define void @test1(ptr %p.start, i64 %len) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[P_START:%.*]], i64 4
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[LSR_IV1:%.*]] = phi ptr [ [[UGLYGEP2:%.*]], [[LOOP]] ], [ [[UGLYGEP]], [[ENTRY:%.*]] ]
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; CHECK-NEXT: [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[LOOP]] ], [ [[LEN:%.*]], [[ENTRY]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = load volatile i32, ptr [[LSR_IV1]], align 4
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; CHECK-NEXT: [[LSR_IV_NEXT]] = add i64 [[LSR_IV]], -1
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; CHECK-NEXT: [[UGLYGEP2]] = getelementptr i8, ptr [[LSR_IV1]], i64 4
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; CHECK-NEXT: [[C:%.*]] = icmp ne i64 [[LSR_IV_NEXT]], 0
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; CHECK-NEXT: br i1 [[C]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %loop
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loop:
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%i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
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%p = phi ptr [ %p.start, %entry ], [ %p.next, %loop ]
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%i.next = add nuw i64 %i, 1
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%p.next = getelementptr i32, ptr %p, i64 1
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load volatile i32, ptr %p.next
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%c = icmp ne i64 %i.next, %len
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br i1 %c, label %loop, label %exit
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exit:
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ret void
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}
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