336d7281ad
The select base, (gep base, offset) to gep base, select (0, offset) fold used to drop inbounds, because the gep base, 0 this introduces might not be inbounds. After the semantics change in D154051, such a GEP is always considered inbounds, in which allows us to preserve the flag here. As the PhaseOrdering test demonstrates, this can result in major optimization improvements in some cases. Differential Revision: https://reviews.llvm.org/D154055
74 lines
2.0 KiB
LLVM
74 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; RUN: opt -O3 -S < %s | FileCheck %s
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define internal i32 @loop(ptr %arg, ptr %arg1) {
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bb:
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br label %bb2
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bb2:
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%phi = phi ptr [ %arg, %bb ], [ %phi8, %bb11 ]
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%phi3 = phi i32 [ 0, %bb ], [ %add, %bb11 ]
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%icmp = icmp ne ptr %arg1, null
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%icmp4 = icmp eq ptr %phi, %arg1
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br i1 %icmp4, label %bb7, label %bb5
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bb5:
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%getelementptr = getelementptr inbounds i32, ptr %phi, i64 1
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br label %bb7
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bb7:
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%phi8 = phi ptr [ %phi, %bb2 ], [ %getelementptr, %bb5 ]
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%phi9 = phi ptr [ null, %bb2 ], [ %phi, %bb5 ]
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%icmp10 = icmp eq ptr %phi9, null
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br i1 %icmp10, label %bb12, label %bb11
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bb11:
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%load = load i32, ptr %phi9, align 4
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%add = add i32 %load, %phi3
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br label %bb2
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bb12:
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ret i32 %phi3
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}
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define i32 @using_alloca() {
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; CHECK-LABEL: define i32 @using_alloca
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; CHECK-SAME: () local_unnamed_addr #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: bb:
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; CHECK-NEXT: ret i32 6
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;
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bb:
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%alloca = alloca [3 x i32], align 4
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store i32 1, ptr %alloca, align 4
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%getelementptr = getelementptr i32, ptr %alloca, i32 1
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store i32 2, ptr %getelementptr, align 4
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%getelementptr1 = getelementptr i32, ptr %alloca, i32 2
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store i32 3, ptr %getelementptr1, align 4
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%getelementptr2 = getelementptr i32, ptr %alloca, i32 3
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%call = call i32 @loop(ptr %alloca, ptr %getelementptr2)
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ret i32 %call
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}
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define i32 @using_malloc() {
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; CHECK-LABEL: define i32 @using_malloc
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; CHECK-SAME: () local_unnamed_addr #[[ATTR0]] {
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; CHECK-NEXT: bb:
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; CHECK-NEXT: ret i32 6
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;
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bb:
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%alloc = call dereferenceable_or_null(64) ptr @malloc(i64 64)
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store i32 1, ptr %alloc, align 4
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%getelementptr = getelementptr i32, ptr %alloc, i64 1
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store i32 2, ptr %getelementptr, align 4
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%getelementptr1 = getelementptr i32, ptr %alloc, i64 2
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store i32 3, ptr %getelementptr1, align 4
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%getelementptr2 = getelementptr i32, ptr %alloc, i64 3
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%call = call i32 @loop(ptr %alloc, ptr %getelementptr2)
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ret i32 %call
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}
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declare ptr @malloc(i64)
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declare void @free(ptr)
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