e8f4e41b6b
We use the same similarity scheme we used for branch instructions for phi nodes, and allow them to be outlined. There is not a lot of special handling needed for these phi nodes when outlining, as they simply act as outputs. The code extractor does not currently allow for non entry blocks within the extracted region to have predecessors, so there are not conflicts to handle with respect to predecessors no longer contained in the function. Recommit of 515eec3553b02533e9a88ee84bc245d5415163da Reviewers: paquette Differential Revision: https://reviews.llvm.org/D106997
95 lines
3.2 KiB
LLVM
95 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --include-generated-funcs
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; RUN: opt -S -verify -iroutliner -ir-outlining-no-cost < %s | FileCheck %s
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; Show that we do not extract similar regions that would involve the splitting
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; of phi nodes on exit.
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define void @function1(i32* %a, i32* %b) {
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entry:
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%0 = alloca i32, align 4
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%c = load i32, i32* %0, align 4
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br label %test1
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test1:
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%e = load i32, i32* %0, align 4
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br label %first
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test:
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%d = load i32, i32* %0, align 4
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br label %first
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dummy:
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ret void
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first:
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%1 = phi i32 [ %c, %test ], [ %e, %test1 ]
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ret void
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}
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define void @function2(i32* %a, i32* %b) {
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entry:
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%0 = alloca i32, align 4
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%c = load i32, i32* %0, align 4
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br label %test1
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test1:
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%e = load i32, i32* %0, align 4
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br label %first
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test:
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%d = load i32, i32* %0, align 4
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br label %first
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dummy:
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ret void
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first:
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%1 = phi i32 [ %c, %test ], [ %e, %test1 ]
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ret void
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}
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; CHECK-LABEL: @function1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[DOTCE_LOC:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[TMP0:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[LT_CAST:%.*]] = bitcast i32* [[DOTCE_LOC]] to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[LT_CAST]])
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; CHECK-NEXT: call void @outlined_ir_func_0(i32* [[TMP0]], i32* [[DOTCE_LOC]])
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; CHECK-NEXT: [[DOTCE_RELOAD:%.*]] = load i32, i32* [[DOTCE_LOC]], align 4
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; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 -1, i8* [[LT_CAST]])
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; CHECK-NEXT: br label [[FIRST:%.*]]
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; CHECK: dummy:
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; CHECK-NEXT: ret void
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; CHECK: first:
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; CHECK-NEXT: [[TMP1:%.*]] = phi i32 [ [[DOTCE_RELOAD]], [[ENTRY:%.*]] ]
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; CHECK-NEXT: ret void
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;
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;
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; CHECK-LABEL: @function2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[DOTCE_LOC:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[TMP0:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[LT_CAST:%.*]] = bitcast i32* [[DOTCE_LOC]] to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[LT_CAST]])
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; CHECK-NEXT: call void @outlined_ir_func_0(i32* [[TMP0]], i32* [[DOTCE_LOC]])
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; CHECK-NEXT: [[DOTCE_RELOAD:%.*]] = load i32, i32* [[DOTCE_LOC]], align 4
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; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 -1, i8* [[LT_CAST]])
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; CHECK-NEXT: br label [[FIRST:%.*]]
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; CHECK: dummy:
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; CHECK-NEXT: ret void
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; CHECK: first:
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; CHECK-NEXT: [[TMP1:%.*]] = phi i32 [ [[DOTCE_RELOAD]], [[ENTRY:%.*]] ]
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; CHECK-NEXT: ret void
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;
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;
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; CHECK-LABEL: define internal void @outlined_ir_func_0(
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; CHECK-NEXT: newFuncRoot:
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; CHECK-NEXT: br label [[ENTRY_TO_OUTLINE:%.*]]
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; CHECK: entry_to_outline:
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; CHECK-NEXT: [[C:%.*]] = load i32, i32* [[TMP0:%.*]], align 4
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; CHECK-NEXT: br label [[TEST1:%.*]]
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; CHECK: test1:
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; CHECK-NEXT: [[E:%.*]] = load i32, i32* [[TMP0]], align 4
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; CHECK-NEXT: br label [[FIRST_SPLIT:%.*]]
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; CHECK: test:
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; CHECK-NEXT: [[D:%.*]] = load i32, i32* [[TMP0]], align 4
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; CHECK-NEXT: br label [[FIRST_SPLIT]]
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; CHECK: first.split:
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; CHECK-NEXT: [[DOTCE:%.*]] = phi i32 [ [[C]], [[TEST:%.*]] ], [ [[E]], [[TEST1]] ]
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; CHECK-NEXT: br label [[FIRST_EXITSTUB:%.*]]
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; CHECK: first.exitStub:
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; CHECK-NEXT: store i32 [[DOTCE]], i32* [[TMP1:%.*]], align 4
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; CHECK-NEXT: ret void
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;
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