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llvm-project/polly/test/Isl/CodeGen/non-affine-phi-node-expansi...

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Only use instructions as insert locations for SCEVExpander SCEVExpander, which we are using during code generation, only allows instructions as insert locations, but breaks in case BasicBlock->end() iterators are passed to it due to it trying to obtain the basic block in which code should be generated by calling Instruction->getParent(), which is not defined for ->end() iterators. This change adds an assert to Polly that ensures we only pass valid instructions to SCEVExpander and it fixes one case, where we used IRBuilder->SetInsertBlock() to set an ->end() insert location which was later passed to SCEVExpander. In general, Polly is always trying to build up the CFG first, before we actually insert instructions into the CFG sceleton. As a result, each basic block should already have at least one branch instruction before we start adding code. Hence, always requiring the IRBuilder insert location to be set to a real instruction should always be possible. Thanks Utpal Bora <cs14mtech11017@iith.ac.in> for his help with test case reduction. llvm-svn: 243830
2015-08-01 17:07:57 +08:00
; RUN: opt %loadPolly -polly-codegen -S < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
%struct.wombat = type {[4 x i32]}
; CHECK: polly.stmt.bb3.entry: ; preds = %polly.start
; CHECK: br label %polly.stmt.bb3
; CHECK: polly.stmt.bb3: ; preds = %polly.stmt.bb3.entry
; CHECK: %polly.subregion.iv = phi i32 [ 0, %polly.stmt.bb3.entry ]
; CHECK: %polly.subregion.iv.inc = add i32 %polly.subregion.iv, 1
; CHECK: br i1 true, label %polly.stmt.bb4, label %polly.stmt.bb5
; CHECK: polly.stmt.bb4: ; preds = %polly.stmt.bb3
; CHECK: br label %polly.stmt.bb13.exit
; CHECK: polly.stmt.bb5: ; preds = %polly.stmt.bb3
; CHECK: %tmp7_p_scalar_ = load i32, i32* %B, !alias.scope !0, !noalias !2
; CHECK: store i32 %tmp7_p_scalar_, i32* %polly.access.cast.arg1, !alias.scope !3, !noalias !4
; CHECK: br label %polly.stmt.bb13.exit
; Function Attrs: nounwind uwtable
define void @quux(%struct.wombat* %arg, i32* %B) {
bb:
br i1 undef, label %bb2, label %bb1
bb1: ; preds = %bb
br label %bb2
bb2: ; preds = %bb1, %bb
%tmp = phi i1 [ true, %bb ], [ undef, %bb1 ]
br label %bb3
bb3: ; preds = %bb13, %bb2
br i1 %tmp, label %bb4, label %bb5
bb4: ; preds = %bb3
br label %bb13
bb5: ; preds = %bb3
%tmp7 = load i32, i32* %B
%tmp12 = getelementptr inbounds %struct.wombat, %struct.wombat* %arg, i64 0, i32 0, i64 0
store i32 %tmp7, i32* %tmp12
br label %bb13
bb13: ; preds = %bb5, %bb4
br i1 false, label %bb3, label %bb14
bb14: ; preds = %bb13
br label %bb15
bb15: ; preds = %bb14
unreachable
}