ff4b1d379f
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
52 lines
1.8 KiB
LLVM
52 lines
1.8 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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declare void @zzz()
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define i32 @lex(i1 %c0, i1 %c1, i32 %r0, i32 %r1, i32 %v) {
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; CHECK-LABEL: @lex(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[C0_NOT:%.*]] = xor i1 [[C0:%.*]], true
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; CHECK-NEXT: [[C1_NOT:%.*]] = xor i1 [[C1:%.*]], true
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; CHECK-NEXT: [[BRMERGE:%.*]] = select i1 [[C0_NOT]], i1 true, i1 [[C1_NOT]]
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; CHECK-NEXT: [[R0_MUX:%.*]] = select i1 [[C0_NOT]], i32 [[R0:%.*]], i32 [[R1:%.*]]
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; CHECK-NEXT: br i1 [[BRMERGE]], label [[COMMON_RET:%.*]], label [[DO_BODY:%.*]]
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; CHECK: common.ret:
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; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ [[R0_MUX]], [[ENTRY:%.*]] ], [ [[R1]], [[DO_BODY]] ]
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; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
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; CHECK: do.body:
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; CHECK-NEXT: call void @zzz()
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; CHECK-NEXT: switch i32 [[V:%.*]], label [[COMMON_RET]] [
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; CHECK-NEXT: i32 10, label [[DO_BODY]]
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; CHECK-NEXT: i32 32, label [[DO_BODY]]
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; CHECK-NEXT: i32 9, label [[DO_BODY]]
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; CHECK-NEXT: ]
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;
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entry:
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br i1 %c0, label %if.end, label %if.then
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if.then: ; preds = %entry
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ret i32 %r0
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if.end: ; preds = %entry
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br i1 %c1, label %do.body, label %do.end
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do.body: ; preds = %if.then193, %if.then193, %if.then193, %do.body, %do.body, %if.end
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call void @zzz()
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switch i32 %v, label %do.end [
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i32 10, label %if.then193
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i32 32, label %do.body
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i32 9, label %do.body
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]
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if.then193: ; preds = %do.body
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switch i32 %v, label %do.end [
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i32 32, label %do.body
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i32 10, label %do.body
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i32 9, label %do.body
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]
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do.end: ; preds = %if.then193, %do.body, %if.end
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ret i32 %r1
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}
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