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a7fa6b8e79
This changes the approach taken to tail-merge the blocks to always create a new block instead of trying to reuse some block, and generalizes it to support dealing not with just the `ret` in the future. This effectively lifts the CallBr restriction, although this isn't really intentional. That is the only non-NFC change here, i'm not sure if it's reasonable/feasible to temporarily retain it. Other restrictions of the transform remain. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D104598
50 lines
1.9 KiB
LLVM
50 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -simplifycfg -simplifycfg-require-and-preserve-domtree=1 < %s | FileCheck %s
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define dso_local i32 @readCBPandCoeffsFromNAL(i1 %c, i32 %x, i32 %y) local_unnamed_addr {
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; CHECK-LABEL: @readCBPandCoeffsFromNAL(
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; CHECK-NEXT: if.end:
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; CHECK-NEXT: br i1 [[C:%.*]], label [[IF_END80:%.*]], label [[COMMON_RET:%.*]]
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; CHECK: common.ret:
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; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ [[Y:%.*]], [[IF_END:%.*]] ], [ 1, [[IF_END172237:%.*]] ], [ 0, [[IF_END80]] ], [ 0, [[IF_END80]] ]
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; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
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; CHECK: if.end80:
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; CHECK-NEXT: switch i32 [[X:%.*]], label [[INFLOOP:%.*]] [
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; CHECK-NEXT: i32 10, label [[IF_END172237]]
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; CHECK-NEXT: i32 14, label [[IF_END172237]]
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; CHECK-NEXT: i32 9, label [[COMMON_RET]]
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; CHECK-NEXT: i32 12, label [[COMMON_RET]]
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; CHECK-NEXT: ]
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; CHECK: if.end172237:
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; CHECK-NEXT: br label [[COMMON_RET]]
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; CHECK: infloop:
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; CHECK-NEXT: br label [[INFLOOP]]
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;
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if.end:
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br i1 %c, label %if.end80, label %if.then64
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if.then64: ; preds = %if.end
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ret i32 %y
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if.end80: ; preds = %if.end
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switch i32 %x, label %lor.lhs.false89 [
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i32 10, label %if.end172237
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i32 14, label %if.end172237
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i32 9, label %if.end172
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]
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lor.lhs.false89: ; preds = %lor.lhs.false89, %if.end80
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%cmp91 = icmp eq i32 %x, 12
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br i1 %cmp91, label %if.end172, label %lor.lhs.false89
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if.end172: ; preds = %lor.lhs.false89, %if.end80
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br label %if.end239
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if.end172237: ; preds = %if.end80, %if.end80
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br label %if.end239
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if.end239: ; preds = %if.end172237, %if.end172
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%cbp.0 = phi i32 [ 1, %if.end172237 ], [ 0, %if.end172 ]
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ret i32 %cbp.0
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}
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