c23b4fbdbb
Now that #149310 has restricted lifetime intrinsics to only work on allocas, we can also drop the explicit size argument. Instead, the size is implied by the alloca. This removes the ability to only mark a prefix of an alloca alive/dead. We never used that capability, so we should remove the need to handle that possibility everywhere (though many key places, including stack coloring, did not actually respect this).
124 lines
4.8 KiB
LLVM
124 lines
4.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=tailcallelim -verify-dom-info -S | FileCheck %s
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; This test checks that TRE would be done for only one recursive call.
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; The test_multiple_exits function has three recursive calls.
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; First recursive call could not be eliminated because there is
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; escaped pointer to local variable. Second recursive call could
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; be eliminated. Thrid recursive call could not be eliminated since
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; this is not last call. Thus, test checks that TRE would be done
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; for only second recursive call.
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; IR for that test was generated from the following C++ source:
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;
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; void capture_arg (int*);
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; void test_multiple_exits (int param);
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; if (param >= 0 && param < 10) {
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; int temp;
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; capture_arg(&temp);
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; // TRE could not be done because pointer to local
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; // variable "temp" is escaped.
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; test_multiple_exits(param + 1);
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; } else if (param >=10 && param < 20) {
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; // TRE should be done.
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; test_multiple_exits(param + 1);
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; } else if (param >= 20 && param < 22) {
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; // TRE could not be done since recursive
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; // call is not last call.
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; test_multiple_exits(param + 1);
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; func();
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; }
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;
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; return;
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; }
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; Function Attrs: noinline optnone uwtable
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declare void @_Z11capture_argPi(ptr %param) #0
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; Function Attrs: noinline optnone uwtable
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declare void @_Z4funcv() #0
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; Function Attrs: noinline nounwind uwtable
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define dso_local void @_Z19test_multiple_exitsi(i32 %param) local_unnamed_addr #2 {
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; CHECK-LABEL: @_Z19test_multiple_exitsi(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TEMP:%.*]] = alloca i32, align 4
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; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
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; CHECK: tailrecurse:
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; CHECK-NEXT: [[PARAM_TR:%.*]] = phi i32 [ [[PARAM:%.*]], [[ENTRY:%.*]] ], [ [[ADD6:%.*]], [[IF_THEN5:%.*]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = icmp ult i32 [[PARAM_TR]], 10
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; CHECK-NEXT: br i1 [[TMP0]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
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; CHECK: if.then:
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; CHECK-NEXT: call void @llvm.lifetime.start.p0(ptr nonnull [[TEMP]]) #1
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; CHECK-NEXT: call void @_Z11capture_argPi(ptr nonnull [[TEMP]])
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; CHECK-NEXT: [[ADD:%.*]] = add nuw nsw i32 [[PARAM_TR]], 1
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; CHECK-NEXT: call void @_Z19test_multiple_exitsi(i32 [[ADD]])
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; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr nonnull [[TEMP]]) #1
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; CHECK-NEXT: br label [[IF_END14:%.*]]
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; CHECK: if.else:
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; CHECK-NEXT: [[PARAM_OFF:%.*]] = add i32 [[PARAM_TR]], -10
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; CHECK-NEXT: [[TMP2:%.*]] = icmp ult i32 [[PARAM_OFF]], 10
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; CHECK-NEXT: br i1 [[TMP2]], label [[IF_THEN5]], label [[IF_ELSE7:%.*]]
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; CHECK: if.then5:
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; CHECK-NEXT: [[ADD6]] = add nuw nsw i32 [[PARAM_TR]], 1
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; CHECK-NEXT: br label [[TAILRECURSE]]
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; CHECK: if.else7:
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; CHECK-NEXT: [[TMP3:%.*]] = and i32 [[PARAM_TR]], -2
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; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i32 [[TMP3]], 20
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; CHECK-NEXT: br i1 [[TMP4]], label [[IF_THEN11:%.*]], label [[IF_END14]]
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; CHECK: if.then11:
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; CHECK-NEXT: [[ADD12:%.*]] = add nsw i32 [[PARAM_TR]], 1
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; CHECK-NEXT: tail call void @_Z19test_multiple_exitsi(i32 [[ADD12]])
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; CHECK-NEXT: tail call void @_Z4funcv()
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; CHECK-NEXT: ret void
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; CHECK: if.end14:
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; CHECK-NEXT: ret void
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;
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entry:
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%temp = alloca i32, align 4
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%0 = icmp ult i32 %param, 10
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br i1 %0, label %if.then, label %if.else
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if.then: ; preds = %entry
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call void @llvm.lifetime.start.p0(ptr nonnull %temp) #2
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call void @_Z11capture_argPi(ptr nonnull %temp)
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%add = add nuw nsw i32 %param, 1
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call void @_Z19test_multiple_exitsi(i32 %add)
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call void @llvm.lifetime.end.p0(ptr nonnull %temp) #2
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br label %if.end14
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if.else: ; preds = %entry
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%param.off = add i32 %param, -10
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%1 = icmp ult i32 %param.off, 10
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br i1 %1, label %if.then5, label %if.else7
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if.then5: ; preds = %if.else
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%add6 = add nuw nsw i32 %param, 1
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call void @_Z19test_multiple_exitsi(i32 %add6)
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br label %if.end14
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if.else7: ; preds = %if.else
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%2 = and i32 %param, -2
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%3 = icmp eq i32 %2, 20
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br i1 %3, label %if.then11, label %if.end14
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if.then11: ; preds = %if.else7
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%add12 = add nsw i32 %param, 1
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call void @_Z19test_multiple_exitsi(i32 %add12)
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call void @_Z4funcv()
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br label %if.end14
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if.end14: ; preds = %if.then5, %if.then11, %if.else7, %if.then
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ret void
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}
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.start.p0(ptr nocapture) #2
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.end.p0(ptr nocapture) #2
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attributes #0 = { nofree noinline norecurse nounwind uwtable }
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attributes #1 = { nounwind uwtable }
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attributes #2 = { argmemonly nounwind willreturn }
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