094190c2f5
Insert a new intrinsic call after splitting critical edges, and verify it. Later commits will update the SSA values to use this new value along indirect branches rather than the callbr's value, and have SelectionDAG consume this new value. Part 2b of https://discourse.llvm.org/t/rfc-syncing-asm-goto-with-outputs-with-gcc/65453/8. Reviewed By: efriedma, jyknight Differential Revision: https://reviews.llvm.org/D139883
107 lines
3.0 KiB
LLVM
107 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -passes="simplifycfg<sink-common-insts>" \
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; RUN: -simplifycfg-require-and-preserve-domtree=1 | FileCheck %s
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define void @callbr_duplicate_dest() {
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; CHECK-LABEL: @callbr_duplicate_dest(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: callbr void asm sideeffect "", "!i"()
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; CHECK-NEXT: to label [[BB:%.*]] [label %bb]
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; CHECK: bb:
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; CHECK-NEXT: ret void
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;
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entry:
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callbr void asm sideeffect "", "!i"()
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to label %bb [label %bb]
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bb:
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ret void
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}
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define void @callbr_can_fold_to_duplicate_dest1() {
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; CHECK-LABEL: @callbr_can_fold_to_duplicate_dest1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: callbr void asm sideeffect "", "!i"()
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; CHECK-NEXT: to label [[COMMON_RET:%.*]] [label %common.ret]
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; CHECK: common.ret:
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; CHECK-NEXT: ret void
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;
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entry:
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callbr void asm sideeffect "", "!i"()
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to label %bb2 [label %bb1]
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bb1:
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ret void
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bb2:
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ret void
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}
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define void @callbr_can_fold_to_duplicate_dest2() {
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; CHECK-LABEL: @callbr_can_fold_to_duplicate_dest2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: callbr void asm sideeffect "", "!i,!i"()
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; CHECK-NEXT: to label [[COMMON_RET:%.*]] [label [[COMMON_RET]], label %common.ret]
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; CHECK: common.ret:
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; CHECK-NEXT: ret void
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;
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entry:
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callbr void asm sideeffect "", "!i,!i"()
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to label %bb1 [label %bb2, label %bb3]
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bb1:
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ret void
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bb2:
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ret void
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bb3:
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ret void
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}
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; Validate that callbr landingpad intrinsics do not get merged (via the
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; IntrNoMerge attribute).
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define i32 @callbr_landingpad_nomerge() {
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; CHECK-LABEL: @callbr_landingpad_nomerge(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[OUT:%.*]] = callbr i32 asm "# $0", "=r,!i"()
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; CHECK-NEXT: to label [[DIRECT:%.*]] [label %entry.indirect_crit_edge]
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; CHECK: entry.indirect_crit_edge:
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; CHECK-NEXT: [[TMP0:%.*]] = call i32 @llvm.callbr.landingpad.i32(i32 [[OUT]])
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; CHECK-NEXT: br label [[COMMON_RET:%.*]]
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; CHECK: direct:
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; CHECK-NEXT: [[OUT2:%.*]] = callbr i32 asm "# $0", "=r,!i"()
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; CHECK-NEXT: to label [[COMMON_RET]] [label %direct.indirect_crit_edge]
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; CHECK: direct.indirect_crit_edge:
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.callbr.landingpad.i32(i32 [[OUT2]])
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; CHECK-NEXT: br label [[COMMON_RET]]
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; CHECK: common.ret:
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; CHECK-NEXT: [[COMMON_RET_OP:%.*]] = phi i32 [ 0, [[DIRECT]] ], [ [[TMP0]], [[ENTRY_INDIRECT_CRIT_EDGE:%.*]] ], [ [[TMP1]], [[DIRECT_INDIRECT_CRIT_EDGE:%.*]] ]
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; CHECK-NEXT: ret i32 [[COMMON_RET_OP]]
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;
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entry:
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%out = callbr i32 asm "# $0", "=r,!i"()
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to label %direct [label %entry.indirect_crit_edge]
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entry.indirect_crit_edge:
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%0 = call i32 @llvm.callbr.landingpad.i32(i32 %out)
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br label %indirect
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direct:
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%out2 = callbr i32 asm "# $0", "=r,!i"()
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to label %direct2 [label %direct.indirect_crit_edge]
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direct.indirect_crit_edge:
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%1 = call i32 @llvm.callbr.landingpad.i32(i32 %out2)
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br label %indirect
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direct2:
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ret i32 0
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indirect:
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%out3 = phi i32 [ %0, %entry.indirect_crit_edge ], [ %1, %direct.indirect_crit_edge ]
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ret i32 %out3
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}
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declare i32 @llvm.callbr.landingpad.i32(i32)
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